The Irish Experience with Sacrococcygeal Teratomas: Are Type IV Lesions More Common than We Think?

INTRODUCTION

 Sacrococcygeal teratomas (SCTs) are rare tumors occurring in approximately 1 in 35,000 to 40,000 live births. The Altman classification is used to describe SCTs. There are four types, with type 1 predominantly external through to type IV which is a presacral, completely internal mass. As far as the authors are aware, this is the first study to focus on type IV SCT lesions.

MATERIALS AND METHODS

 Using ICD-10-AM (The International Statistical Classification of Diseases and Related Health Problems, Tenth Revision, Australian Modification) codes, we identified all patients in the Republic of Ireland with a diagnosis of SCT from 2004 to 2020. The following information was obtained for each patient: gender, time of diagnosis, clinical presentation, method of diagnosis, Altman classification, biomarkers, age at operation, surgical technique, pathology, recurrence, and age at most recent follow-up.

RESULTS

 There were 29 patients in total; 23 females (79%) and 6 males (21%). In total, 16 (55%) were diagnosed antenatally, 4 (14%) at less than 1 month, 4 (14%) less than 1 year, 3 (10%) age 2 to 4 years, and 2 (7%) were aged 5 to 12 years. In addition, 22 (76%) were mature teratomas, 2 (7%) immature teratomas, and 5 (17%) were malignant tumors. There were 6 (21%) type I lesions, 9 (30%) type II, 6 (21%) type III, and 8 (28%) type IV lesions.

CONCLUSION

 In Altman's original 1974 study, type IV lesions were present in 10% of cases. As a result, this is the most frequently quoted figure. Type IV lesions were present in 28% of cases in our study. We propose that type IV lesions may be more common than the current literature suggests and consequently a higher index of suspicion of their presence should be entertained.

Femoral hernias: A paediatric surgical enigma

PURPOSE

In the paediatric population, femoral hernia (FH) represents an uncommon and often misdiagnosed pathology. This study aimed to review our experience with the management of FH in children.

METHODS

Medical records were retrospectively reviewed for all patients presenting to the paediatric surgical service in Ireland over a 15-year period (2004-2019), who were operated on for FH. Collected data included demographics, preoperative diagnosis, operative details, complications and follow-up.

RESULTS

During the study period, n = 26 patients (n = 18 males) underwent FH repair, with a median age at surgery 6.9 years (range 3-16 years). During the same period n = 5693 patients underwent inguinal herniotomy, resulting in a FH to inguinal hernia (IH) ratio of 1:219 and a FH incidence of 0.45% of all groin hernias. The right side was affected in n = 18 (69.2%) cases and all cases were unilateral. A correct preoperative diagnosis was established in n = 16 (61.5%) cases, n = 8 (30.8%) cases were misdiagnosed as IH and the diagnosis was equivocal in 2 cases (7.7%). All operations were performed on an elective basis. In 3 patients from the misdiagnosed group, FH was found at first operation following negative groin exploration for IH. The remaining 5 patients underwent previous groin exploration for suspected IH and represented with clinical picture of groin hernia recurrence. All patients with a correct preoperative diagnosis underwent a FH repair via an inguinal or infra-inguinal approach. The content of the hernia sac was preperitoneal fat in n = 18 cases, lymph nodes in n = 2 cases, omentum in n = 1 and an empty sac in n = 1. There were no postoperative complications or recurrences. Median follow-up time was 6 weeks (range 0-2.5 years).

CONCLUSION

In the paediatric population, FH is a rare pathology and can be a challenging diagnosis. FH is commonly misdiagnosed as IH and may require more than one operation to correctly identify and treat. A high index of suspicion of FH should be maintained in patients who have a negative groin exploration for IH in the setting of a clear pre-operative diagnosis of a groin hernia. FH should also be considered in the differential diagnosis when an IH appears to recur.

Medical alert card: a valuable tool in the management of Hirschsprung's-associated enterocolitis from parental perspective

PURPOSE

Awareness of Hirschsprung's-associated enterocolitis (HAEC) among patient's families and medical staff can lead to prompt recognition of symptoms and earlier implementation of management. We designed an HAEC medical alert card to raise awareness of HAEC among medical staff and carers of children with Hirschsprung's disease (HD). Our aim was to investigate parental opinion on the utility of this tool.

METHODS

All patients diagnosed with HD in two institutions over a period of 14 years received an HAEC alert card and were invited to answer a 1-year follow-up structured questionnaire.

RESULTS

A total of 123 patients received an HAEC card. The response rate for the follow-up questionnaire was 62% (n = 76). The majority 96% (n = 73) of the responders considered the card useful. A total of 89% (n = 68) of patients or parents stated that they carry the card with them, while 39% (n = 30) of them have used it on 57 occasions. The majority (83%; n = 25) of these declared that, when presented, the card increased awareness among medical staff and on 53% (n = 16) occasions prompted contact with the tertiary centre.

CONCLUSION

The HAEC medical card was found useful by most parents of HD patients. This tool increased awareness of HAEC and improved communication between peripheral hospitals and tertiary paediatric institutions. Therefore, we feel the HAEC alert card may be used in institutions with high HD addressability.

The Extent of the Transition Zone in Hirschsprung Disease

BACKGROUND

Retained transition zone is a leading cause of obstructive symptoms after pull-through operation in Hirschsprung's disease.

OBJECTIVE

We aimed to evaluate the extent of the histological transition zone in patients with Hirschsprung's disease.

DESIGN

We performed an observational study. DAB+ immunohistochemistry for Protein Gene Product 9.5 was used to evaluate the neuronal networks in serial sections of pull-through specimens obtained from children with Hirschsprung's disease (n = 12). Reference ranges for ganglion size/density and nerve trunk diameter were statistically determined using healthy controls obtained from colostomy specimens from children with anorectal malformations (n = 8). The transition zone was defined as ganglionic bowel exhibiting ganglion hypoplasia, hypertrophic nerve trunks, or partial circumference aganglionosis.

RESULTS

The mean submucosal nerve trunk diameter in controls was 19.56 μm +/- 3.87 μm. The median age at pull-through for Hirschsprung's disease was 5 months (3-14 months). The median length of the transition zone across the population was 8 cm (4-22 cm). Median transition zone extent was significantly longer in patients with long-segment aganglionosis (n = 6) compared to rectosigmoid aganglionosis (n = 6, 13 cm vs 6 cm, p = 0.041). Due to the age of the patients enrolled, long-term follow-up of bowel function is not yet available.

CONCLUSION

Our data suggest that, in children with rectosigmoid Hirschsprung's disease, the transition zone can extend for up to 13 cm. In children with long-segment disease, a longer transition zone is possible. Extended resection at a minimum 5 cm beyond the most distal ganglionic intra-operative biopsy and intra-operative histological examination of the proximal resection margin are required to minimize transition zone pull-through.

LEVEL OF EVIDENCE

2.

Colectomies in children with inflammatory bowel disease: a national referral centre experience

OBJECTIVES

Few studies have reported on the utility and efficacy of laparoscopic colectomy in the paediatric population. We aim to compare the characteristics and outcomes of children with inflammatory bowel disease (IBD) who underwent open vs laparoscopic treatment at our centre.

METHODS

A 10-year retrospective review was performed. Collected data included demographics, indication for surgery, operative characteristics, histopathology results, post-operative course and peri-operative complications.

RESULTS

A total of 58 patients underwent subtotal colectomy for IBD, with 38 laparoscopic procedures. The cohort included 33 males and 25 females with a mean age at surgery of 12.9 ± 3.3 years. The pre-operative diagnosis was ulcerative colitis in n = 41, Crohn's disease in n = 5 and indeterminate colitis in n = 11. There was an 84.2% concordance between the pre-operative and the post-operative histological diagnoses. Overall, 34 (58.6%) patients had complications, of which 19 (32.7%) patients required return to theatre. The complication rate was significantly smaller for laparoscopic compared to open procedures (42.1% vs 75%) as well as for elective compared with emergency colectomies (38.4% vs 75%). Four patients (10.5%) required conversion to open approach.

CONCLUSIONS

Laparoscopic approach is feasible and safe in most paediatric patients with IBD and has a lower complication rate and better recovery than open procedures, especially when performed in an elective setting.

Adolescent de novo hydroceles - should they be dealt with by inguinal or scrotal approach?

AIM

The objective of this study was to investigate the optimal approach for the treatment of hydroceles in adolescents.

MATERIALS AND METHODS

A retrospective chart review of all adolescents (10-16 years old) diagnosed with a de-novo hydrocele in 2 tertiary care institutions over a 10 year period (2007-2016) was performed comparing the inguinal and trans-scrotal (Jaboulay) approaches.

RESULTS

Fifty-three boys with a mean age of 13.4 years (range 10-16 years) were diagnosed with hydrocele. The inguinal approach was used in 31 (59%) patients for treatment of their hydrocele. In 19 (61%) of these cases a patent processus vaginalis (PPV) ligation was performed. In the other 12 (39%) patients the PPV was closed or not found and a further repair of the hydrocele through the same inguinal incision was performed. A transcrotal Jaboulay procedure was performed in 22 (41%) of the patients. There was no difference in the complications rate between inguinal and trans-scrotal approaches (p = 0.71). Age of presentation less than 12 years was associated with the presence of a PPV (p < 0.05).

CONCLUSIONS

A trans-scrotal approach should be considered as first-line in adolescents when the history is not suggestive of a communicating hydrocele. Children less than 12 years of age are more likely to have a PPV and an inguinal approach may be more appropriate.

TYPE OF STUDY

Retrospective comparative study LEVEL OF EVIDENCE: Level II.

Managing the Complex Patient with Degenerative Cervical Myelopathy: How to Handle the Aging Spine, the Obese Patient, and Individuals with Medical Comorbidities

Degenerative cervical myelopathy (DCM) is the most common cause of nontraumatic spinal cord injury worldwide. Even relatively mild impairment in functional scores can significantly impact daily activities. Surgery is an effective treatment for DCM, but outcomes are dependent on more than technique and preoperative neurologic deficits.

A Comparative Study of Three Different Types of Stem Cells for Treatment of Rat Spinal Cord Injury

Three different sources of human stem cells-bone marrow-derived mesenchymal stem cells (BM-MSCs), neural progenitors (NPs) derived from immortalized spinal fetal cell line (SPC-01), and induced pluripotent stem cells (iPSCs)-were compared in the treatment of a balloon-induced spinal cord compression lesion in rats. One week after lesioning, the rats received either BM-MSCs (intrathecally) or NPs (SPC-01 cells or iPSC-NPs, both intraspinally), or saline. The rats were assessed for their locomotor skills (BBB, flat beam test, and rotarod). Morphometric analyses of spared white and gray matter, axonal sprouting, and glial scar formation, as well as qPCR and Luminex assay, were conducted to detect endogenous gene expression, while inflammatory cytokine levels were performed to evaluate the host tissue response to stem cell therapy. The highest locomotor recovery was observed in iPSC-NP-grafted animals, which also displayed the highest amount of preserved white and gray matter. Grafted iPSC-NPs and SPC-01 cells significantly increased the number of growth-associated protein 43 (GAP43+) axons, reduced astrogliosis, downregulated Casp3 expression, and increased IL-6 and IL-12 levels. hMSCs transiently decreased levels of inflammatory IL-2 and TNF-α. These findings correlate with the short survival of hMSCs, while NPs survived for 2 months and matured slowly into glia- and tissue-specific neuronal precursors. SPC-01 cells differentiated more in astroglial phenotypes with a dense structure of the implant, whereas iPSC-NPs displayed a more neuronal phenotype with a loose structure of the graft. We concluded that the BBB scores of iPSC-NP- and hMSC-injected rats were superior to the SPC-01-treated group. The iPSC-NP treatment of spinal cord injury (SCI) provided the highest recovery of locomotor function due to robust graft survival and its effect on tissue sparing, reduction of glial scarring, and increased axonal sprouting.

Expression of connexin 26 and connexin 43 is reduced in Hirschsprung's disease

BACKGROUND

Despite having an optimal pull-through operation, some children with Hirschsprung's disease (HSCR) continue to experience persistent bowel symptoms. Coordinated colonic electrical activity depends on intercellular communication between the enteric nerves, interstitial cells of Cajal (ICCs), smooth muscle cells, and fibroblast-like (platelet-derived growth factor receptor-alpha-positive) cells. Gap junctions are low-resistance channels composed of connexin (Cx) proteins which couple cells electrically and chemically. We aimed to evaluate the expression patterns of Cx26, Cx36, and Cx43 in the colon of children with HSCR and in healthy control colon.

MATERIALS AND METHODS

Entire resected colonic specimens were collected from children undergoing pull-through surgery for HSCR (n = 10). Colonic controls were collected at colostomy closure in children with imperforate anus (n = 8). Distribution of Cx26, Cx36, and Cx43 was assessed using double-labeled immunofluorescence and confocal microscopy. Protein expression was quantified using Western blot analysis.

RESULTS

Sparse punctate Cx36 expression was seen in the myenteric plexus in nerve trunks and some platelet-derived growth factor receptor-alpha-positive cell and ICC fibers. Cx26 was similarly distributed, although it was not coexpressed in ICCs. Cx43 was only coexpressed with ICCs in the myenteric plexus. Expression of Cx26 and Cx43 was markedly reduced in the aganglionic colon in HSCR compared to controls, while Cx26 expression was also moderately reduced in the ganglionic bowel in HSCR.

CONCLUSIONS

Reduced expression of Cx26 and Cx43 is implicated in the pathophysiology of colonic dysmotility in the aganglionic bowel as well as, in the case of Cx26, the ganglionic bowel in HSCR.

Spinal Cord Compression Secondary to Extramedullary Hematopoiesis: Case Report and Review of the Literature

Extramedullary hematopoiesis (EMH) is a rare cause of spinal cord compression (SCC). EMH represents the growth of blood cells outside of the bone marrow and occurs in a variety of hematologic illnesses, including various types of anemia and myeloproliferative disorders. Although EMH usually occurs in the liver, spleen, and lymph nodes, it may also occur within the spinal canal. When this occurs, the mass effect can compress the spinal cord, potentially leading to the development of neurological deficits. We present a case of SCC secondary to EMH. This report illustrates the importance of considering EMH in the differential diagnosis of SCC, even in the absence of signs of its most common etiologies.

Altered tryptophan hydroxylase 2 expression in enteric serotonergic nerves in Hirschsprung’s-associated enterocolitis

AIM: To determine if expression of colonic tryptophan hydroxylase-2 (TPH2), a surrogate marker of neuronal 5-hydroxytryptamine, is altered in Hirschsprung’s-associated enterocolitis.

METHODS: Entire resected colonic specimens were collected at the time of pull-through operation in children with Hirschsprung’s disease (HSCR, n = 12). Five of these patients had a history of pre-operative Hirschsprung’s-associated enterocolitis (HAEC). Controls were collected at colostomy closure in children with anorectal malformation (n = 10). The distribution of expression of TPH2 was evaluated using immunofluorescence and confocal microscopy. Protein expression of TPH2 was quantified using western blot analysis in the deep smooth muscle layers.

RESULTS: TPH2 was co-expressed in nitrergic and cholinergic ganglia in the myenteric and submucosal plexuses in ganglionic colon in HSCR and healthy controls. Co-expression was also seen in submucosal interstitial cells of Cajal and PDGFRα⁺ cells. The density of TPH2 immuno-positive fibers decreased incrementally from ganglionic bowel to transition zone bowel to aganglionic bowel in the myenteric plexus. Expression of TPH2 was reduced in ganglionic bowel in those affected by pre-operative HAEC compared to those without HAEC and healthy controls. However, expression of TPH2 was similar or high compared to controls in the colons of children who had undergone diverting colostomy for medically refractory HAEC.

CONCLUSION: Altered TPH2 expression in colonic serotonergic nerves of patients with HSCR complicated by HAEC may contribute to intestinal secretory and motor disturbances, including recurrent HAEC.

Altered neurotransmitter expression profile in the ganglionic bowel in Hirschsprung's disease

PURPOSE

Despite having optimal pull-through (PT) surgery for Hirschsprung's disease (HSCR), many patients experience persistent bowel symptoms with no mechanical/histopathological cause. Murine models of HSCR suggest that expression of key neurotransmitters is unbalanced proximal to the aganglionic colonic segment. We aimed to investigate expression of key enteric neurotransmitters in the colon of children with HSCR.

METHODS

Full-length PT specimens were collected fresh from children with HSCR (n=10). Control specimens were collected at colostomy closure from children with anorectal malformation (n=8). The distributions of neuronal nitric oxide synthase (nNOS), choline acetyltransferase (ChAT), vasoactive intestinal peptide (VIP), and substance P (SP) were evaluated using immunofluorescence and confocal microscopy. Neurotransmitter quantification was with Western blot analysis.

RESULTS

ChAT expression was high in aganglionic bowel and transition zone but reduced in ganglionic bowel in HSCR relative to controls. Conversely, nNOS expression was markedly reduced in aganglionic bowel but high in ganglionic bowel in HSCR relative to controls. VIP expression was similar in ganglionic HSCR and control colon. SP expression was similar in all tissue types.

CONCLUSION

Imbalance of key excitatory and inhibitory neurotransmitters in the ganglionic bowel in HSCR may explain the basis of bowel dysmotility after an optimal pull-through operation in some patients.

Unusual childhood presentations of abdominal non-Hodgkin's lymphoma

Non-Hodgkin's lymphoma (NHL) is a relatively common childhood cancer that can present in a myriad of ways. It is essential that NHL is included in the differential diagnosis of children presenting with an abdominal complaint, especially those with unexplained or prolonged symptoms. We describe three acute pediatric presentations of abdominal NHL, two of which presented as acute abdomen (the first mimicking intussusception and the second appendicitis), and the third involving lower limb edema. This case series illustrates the array of presentations of abdominal NHL and the diagnostic challenges that they can provide.

Rho-kinase expression in Hirschsprung's disease

BACKGROUND

Rho-kinase (ROCK) is the primary effector protein in the RhoA pathway, which regulates Ca(2+)-independent smooth muscle contraction in the human bowel. This pathway has been reported to be hyper-activated in the aganglionic bowel of EDNRB-null (-/-) rats compared to the ganglionic bowel from EDNRB (+/+) rats. We hypothesised that ROCK expression is up-regulated in human aganglionic bowel and designed this study to investigate ROCK 1 and ROCK 2 expression in Hirschsprung's disease (HSCR) and controls.

MATERIALS AND METHODS

Full-length specimens were collected following pull-through surgery for HSCR (n = 9). Colonic controls (n = 6) were obtained during colostomy closure from patients with anorectal malformations. Distribution of ROCK 1/2 expression was evaluated using double-labelled immunofluorescence and confocal microscopy. ROCK1/2 protein expression was assessed in mucosa and tunica muscularis using western blot analysis.

RESULTS

There was strong expression of both ROCK 1 and ROCK 2 in interstitial cells of Cajal (ICCs) and ganglia. ROCK 1 expression was reduced in aganglionic bowel compared to HSCR ganglionic bowel and controls in both mucosa and tunica muscularis. ROCK 2 expression was similar in the colon of children with HSCR and controls.

CONCLUSIONS

This is the first report of strong ROCK expression in colonic ICCs. Although the rat model of aganglionic bowel suggests that Ca(2+)-independent smooth muscle contraction involving ROCK is hyper-activated, our data indicate ROCK 1 expression is decreased in aganglionic bowel and ROCK 2 expression is unaltered in children with HSCR.

A Paediatric Hernia with a Twist: The Presentation, Imaging Findings and Management of a Strangulated Ovarian Hernia

Indirect inguinal hernias are the most commonly encountered congenital abnormality in infants. They may be complicated by herniation of abdominal or pelvic viscus. In girls, a herniated ovary is a relatively common finding, however torsion of the ovary is infrequent. A tender irreducible inguinal hernia in an infant girl should raise the possibility of a strangulated herniated ovary as it requires urgent surgical attention. When in doubt, ultrasound with colour Doppler easily confirms the diagnosis. Here we present the case of an ovarian inguinal hernia which had undergone torsion and review the presentation, imaging findings and management.

Percutaneous endoscopic gastrostomy (PEG) does not worsen vomiting in children

PURPOSE

We aimed to evaluate the rate and examine potential predictors of subsequent anti-reflux procedures in a population undergoing percutaneous endoscopic gastrostomy (PEG) insertion.

MATERIALS

We retrospectively reviewed the pre- and post-operative clinical course of patients undergoing PEG insertion over a 10-year period with respect to indication, underlying co-morbidity, and GER investigation and management.

RESULTS

We reviewed data on 170 patients. Neurological disability (e.g., cerebral palsy) was the most common underlying condition in those undergoing PEG insertion (n = 104) followed by cystic fibrosis (n = 29). Oropharyngeal dysphagia and failure to thrive were the commonest indications for PEG. Eight patients (4.7%) reported increased frequency of vomiting after PEG, 6 (75%) of whom had a pre-operative diagnosis of GER. Two (25%) patients from this sub-group subsequently required anti-reflux surgery. Patient's with neurological disease were not at increased risk of new-onset GER or increased vomiting following PEG insertion compared to those with non-neurological conditions (p = 0.259). In total, 8 (4.7%) and 7 (4.1%) patients underwent fundoplication and gastrojejunal tube insertion, respectively.

CONCLUSIONS

PEG insertion does not appear to induce symptomatic gastro-oesophageal reflux in the majority of children, suggesting that in the majority of cases, a concurrent anti-reflux procedure is unnecessary. Parents should be counseled accordingly.

The national incidence and outcomes of gastroschisis repairs

The birth prevalence of gastroschisis worldwide has increased over the past decades. We aim to determine the Irish national incidence of gastroschisis repairs (NIGR) over a 5 year period (2007- 2011) and clinical outcomes by a retrospective cohort review of cases admitted to all Irish paediatric surgical units. Seventy patients were identified. The NIGR per 10,000 live births was 1.96 (SD 0.51) per year. Fifty eight (82%) were antenatally detected. Twenty eight (40%) had primary repair day 1 with the remaining repaired in a median of 3(2-5.75) days. Thirty three (47%) experienced a central catheter related infection. Duration of stay was significantly correlated with decreasing gestational age (p = 0.016), decreasing birthweight (p = 0.005), increasing numbers of blood transfusions (p < 0.001) and co-morbidity or complication (p < 0.001). This study provides individual centres with patient outcomes and national data that can be provided to parents and clinical staff regarding the clinical course of gastroschisis.

Batteries not included

We report two cases of oesophageal lodgement of ingested button batteries (BB) in young children. In one case the diagnosis and subsequent treatment was made in a timely fashion and the patient suffered no sequelae. In the second case there was a delay in diagnosis and the patient subsequently suffered both early and late complications. The purpose of this report is to highlight theingestion importance of the correct management of suspected BB ingestion.

Delayed diagnosis of anorectal malformation--a persistent problem

Delayed diagnosis of anorectal malformation (ARM) is an avoidable event associated with significant complications and morbidity. Previous studies have suggested higher than expected rates of delayed diagnosis, especially when a threshold of 24 hours of life is used to define delayed diagnosis. The aim of this study is to highlight the prevalence of delayed diagnosis of ARM in Ireland and to determine if any improvement in rates of delayed diagnosis of ARM has occurred since we previously examined this problem over a 10 year period in 2010. We compared trends in the incidence of delayed diagnosis of ARM between two cohorts, A (1999-2009) and B (2010-2012). Delayed diagnosis was defined as one occurring after 48 hours of life. Delayed diagnosis occurred in 29 cases (21.3%) in total, with no difference in the incidence of delayed diagnosis between cohort A (21 patients [21.2%]) and cohort B (8 patients [21.6%) being recorded. The rate of bowel perforation in patients with delayed diagnosis was 10.3% (3 cases). Our findings highlight the importance of a careful, comprehensive clinical examination in diagnosing ARM and suggest this is still sub-optimal. We strongly support the use of a nationally devised algorithm to aid diagnosis of ARM in order to avoid life-threatening complications.

Early experience in laparoscopic colectomy for refractory colitis in children

There is limited literature endorsing the laparoscopic approach for the treatment of refractory colitis in children. We report our experiences of paediatric laparoscopic colectomies performed for ulcerative colitis. A retrospective review over a three year period was undertaken. Operative time, length of stay, post-operative analgesia, time to commencement of diet, and complications were recorded. Nine laparoscopic colectomies were performed. Median operative time was 320 minutes (range--240-475). Mean time to commencement of full diet was 3.9 days (range 2-8). Median length of stay was 6 days (range--5-16). In our experience, laparoscopic colectomy in children is a feasible and superior method to open colectomy and in our opinion, facilitates further restorative procedures and will become the default method of treatment in the near future.

Radiological versus clinical evidence of malrotation, a tortuous tale--10-year review

INTRODUCTION

Malrotation is a common abnormality, often diagnosed in the neonatal period. Symptoms may be nonspecific and clinical signs of volvulus are often only seen in the late stages when there has been significant ischemic insult to the bowel. The gold standard diagnostic investigation is the upper gastrointestinal (UGI) contrast study. This study was designed to assess the incidence of negative laparotomy in patients with malrotation diagnosed on UGI contrast study and to identify the clinical signs and symptoms at presentation.

METHODS

A retrospective review of patients who underwent laparotomy for malrotation, over a 10-year period (2001 to 2010) was performed. Inclusion criteria were patients<16 years of age with a diagnosis of malrotation on preoperative UGI contrast study.

RESULTS

A total of 72 patients were reviewed. UGI contrast study diagnosed 43(60%) cases of malrotation without volvulus, and 29(40%) cases of malrotation with volvulus. Laparotomy revealed that 39(54.2%) patients had malrotation without volvulus, 27(37.5%) had malrotation with volvulus, and 6(8.3%) had no evidence of malrotation. A total of 13(18%) patients had an incorrect diagnosis on UGI contrast study; 6(8.3%) had normal anatomy, 3(4.2%) diagnosed with malrotation without volvulus, had volvulus at laparotomy, and 4(5.5%) diagnosed with malrotation and volvulus had no volvulus at laparotomy.

CONCLUSION

UGI contrast study can occasionally be misleading. In the above study, we have shown that there is a significant rate of negative laparotomy following diagnosis of malrotation on UGI contrast study. Therefore, we would advocate that all parents of patients undergoing laparotomy for malrotation should be informed of the risk of negative laparotomy as part of the consent process.

The incidence of symptomatic malrotation post gastroschisis repair

Gastroschisis is known to be associated with abnormal bowel rotation. Currently, the broadly accepted practice is not to perform Ladd's procedure routinely at the time of closure of gastroschisis defects. However the incidence of symptomatic malrotation and volvulus post gastroschisis repair is unknown; this incidence is important in view of the current practice of bedside gastroschisis closure. This study examined the incidence of symptomatic malrotation and volvulus following gastroschisis repair.

METHOD

Patients who had undergone gastroschisis repair between 1999 and 2009 in any of 2 tertiary centers were identified using the Hospital Inpatient Enquiry system. The medical records were reviewed to obtain demographic data and postoperative outcomes. Patients were contacted for follow-up.

RESULTS

128 patients were identified with a median postoperative follow-up of 4 years (range: 6 weeks to 12 years). Upper gastrointestinal (GI) contrast studies were performed in 30 patients (23.4%), 21 (16.4%) of whom showed evidence of malrotation. Malrotation was documented during the primary repair in 12 patients (9.4%); however Ladd's procedure was performed primarily in only 3 patients. 7 patients underwent Ladd's procedure in a second laparotomy for mechanical obstruction secondary to causes not related to malrotation and volvulus. A total of 29 patients (22.7%) had either operative or radiological evidence of malrotation. None of these patients developed volvulus after being followed for a median period of 4 years.

CONCLUSION

Bedside gastroschisis closure without concomitant Ladd's procedure is a safe practice. None of the patients with documented malrotation developed volvulus post gastroschisis repair.

A 9-year single center experience with circumumbilical Ramstedt's pyloromyotomy

INTRODUCTION

Pyloric stenosis is a common cause of vomiting in infancy and is usually treated with a Ramstedt's pyloromyotomy. In this study we retrospectively reviewed our experience with the circumumbilical incision for the treatment of pyloric stenosis with a particular emphasis on the relation between postoperative emesis and postoperative time to feeds.

MATERIAL AND METHOD

The medical records of all patients undergoing pyloromyotomy for IHPS from January 2000 to December 2008 were reviewed retrospectively. Patient details were recorded and statistically analyzed using SPSS version 13. We reviewed our experience looking specifically at the postoperative time to initial feeds as a way of minimizing hospital stay.

RESULTS

513 patients' notes were available for the study. There were 440 males and 73 females (M:F ratio 6:1). Median age at operation was 40 days (2-194 days) and a positive family history was obtained in 11.9%. Median duration of symptoms was 10 days (range 1-60 days). There were 31 (6%) complications related to surgery. The average number of postoperative emesis episodes was 1.9. The median postoperative hospital stay was 2 days (1-60). The average time to feeding was 20 h (1-69).

CONCLUSION

This is a large single-center retrospective study where, in the era of minimally invasive surgery, Ramstedt's pyloromyotomy via the circumumbilical approach has a low rate of complications and is a safe and feasible method to treat pyloric stenosis. The establishment of feeds soon after surgery minimizes the postoperative in-hospital stay.

A novel association of gastric ischaemia and aortic coarctation

We report a newborn who presented with acute abdominal distension secondary to gastric ischaemia with an associated undiagnosed coarctation of the descending aorta. This is the first description of such a previously unrecognised association, which is discussed further with reference to the current literature.

Anaesthetic implications of laparoscopic splenectomy in patients with sickle cell anaemia

With the increasing immigrant population in the Republic of Ireland, the number of patients with sickle cell disease (SCD) seen in the paediatric hospitals is climbing. In this case report, we review the anaesthetic implications and outcome of the first two paediatric patients with SCD to have a laparoscopic splenectomy due to repeated splenic infarcts in the Republic of Ireland.

Long-term complications following operative intervention for intestinal malrotation: a 10-year review

Intestinal malrotation associated with a volvulus requires immediate surgical intervention. The long-term sequelae of Ladd's procedure and its complications are not well defined. We designed this study to investigate the long-term complications following operative intervention for intestinal malrotation. Patients who have undergone a Ladd's procedure for malrotation from January 1999 till December 2008, from two tertiary centres, were identified using the Hospital Inpatient Enquiry system. Charts were analysed to obtain information about mode of presentation, method of diagnosis and postoperative outcomes. Patients were contacted for follow-up. One hundred and sixty-one patients were identified over the 10-year period with a postoperative follow-up time ranging from 2 months to 10 years. The median age at surgery was 9 days (1 day-12 years); 38 (23%) underwent elective Ladd's procedure for malrotation. Thirty-eight patients had intraoperative incidental findings of a malrotation during different procedures; 120 (74.5%) patients were performed as an emergency procedure. Fourteen patients (8.7%) developed complications following surgery. Nine patients developed adhesive small bowel obstruction, five required operative adhesiolysis having failed conservative treatment. There was one case of recurrent volvulus and three mortalities in our series. In our experience, looking at 161 patients with a mean follow-up of 5 years Ladd's procedure has a low postoperative morbidity and remains a vital treatment for malrotation in children.

Laparoscopic Heller's cardiomyotomy

Achalasia is a rare motility disorder which causes failure of relaxation of the lower oesophageal sphincter (LES) and is thought to affect 0.31/100,000 children per year in Ireland. The classic presentation is difficulty swallowing and vomiting undigested food, and children can often present with chest pain. In some instances, these symptoms can lead to considerable weight loss. In this report, we present 2 cases of patients with achalasia who have also been the first 2 cases of laparoscopic Heller's cardiomyotomy performed in children in the Republic of Ireland.

Laparoscopic appendectomy after conservative management of appendix mass

The purpose of this study was to demonstrate the safety and efficacy of laparoscopic appendicectomy following non-operative management of appendix mass in children. Medical records of 103 consecutive patients (61 males, 42 females) who underwent non-operative treatment of appendix mass followed by laparoscopic elective appendicectomy were examined. Their ages ranged from 2 years 5 months to 15 years (mean 8.3 years). All patients were treated conservatively by close observation, antibiotics and intravenous fluids. Once the child was fit for discharge laparoscopic elective appendicectomy was booked for 4-6 weeks later. Ninety-three children responded to the initial conservative treatment and were discharged after a mean hospital stay of 5.6 days (range 3-10 days). Ten (9.7%) did not respond to initial treatment and developed appendix abscess requiring drainage. Average hospital stay in the 97 patients who had laparoscopic elective appendicectomy was 2.5 days (range 1-5 days). Three patients developed complications after elective appendicectomy, a stitch abscess in one, paralytic ileus in one and wound infection in one. Histological examination revealed fibrosed or resolving appendicitis in 52, acute or subacute appendicitis in 24, carcinoid tumour in two and normal appendix in 19. Laparoscopic elective appendicectomy is a safe and effective method of treatment following conservative treatment of appendix mass. Not only does it make the dissection and resection of the appendix easier but it also has the added advantage of performing adhesiolysis.

Notable sequential alterations in notochord volume during development in the Adriamycin rat model

BACKGROUND/PURPOSE

The Adriamycin rat model (ARM) is a well-established model of the vertebral, anorectal, cardiac, tracheoesophageal, renal, and limb association. An important finding in the ARM is that Adriamycin induces abnormal notochord morphology in the region of the foregut. Having recently demonstrated notochord hypertrophy in ARM embryos, the authors designed this study to assess notochord volume sequentially from gestational days 10 to 14 (E10-E14) to test the hypothesis that notochord hypertrophy occurs maximally soon after Adriamycin administration.

METHODS

Adriamycin (1.75 mg/kg) was administered intraperitoneally to pregnant rats on E7, E8, and E9. Control animals were given saline. Embryos were recovered at E10, E11, E12, E13, and E14 and embedded in paraffin. Quantitative morphology using the Cavalieri technique was performed on hematoxylin and eosin-stained transverse serial sections to determine total embryo and total notochord volume.

RESULTS

The percentage volume of notochord per embryo was significantly increased (P < .05) in Adriamycin-treated embryos at all gestational time frames from E10 to E14 when compared with equivalent controls. This increased volume of notochord was found to be maximal at E11.

CONCLUSIONS

These data support the authors' previous finding that Adriamycin induces notochord hypertrophy and suggest that notochord volume is increased relative to embryo volume soon after Adriamycin administration and is maximal on E11. The abnormal increase in notochord volume during the critical phase of development may interfere with organogenesis, resulting in the vertebral, anorectal, cardiac, tracheoesophageal, renal, and limb association.

Notochord anomalies in the adriamycin rat model: A morphologic and molecular basis for the VACTERL association

BACKGROUND/PURPOSE

The Adriamycin rat model (ARM) is a reliable model of the VACTERL association. The notochord is structurally abnormal in the region of the foregut, midgut, and hindgut in the ARM. The authors hypothesised that notochord anomalies allow ectopic expression of molecular signals in the developing embryo and thus lead to VACTERL malformations. This study was designed to investigate this hypothesis.

METHODS

Adriamycin (1.75 mg/kg) was administered intraperitoneally to pregnant rats on days 7, 8, and 9 of gestation. Control animals were given saline. Embryos were recovered on gestational days 10.5 to 14 at (1/2)-day intervals and at full term. The first group of embryos were embedded in resin, and sagittal sections stained with Toluidine blue were studied for morphologic abnormalities. The second group of embryos were examined using in situ hybridization for the expression of Sonic Hedgehog (Shh), a patterning gene implicated in the etiology of the VACTERL association.

RESULTS

Twenty-seven of the 28 (96.4%) full-term embryos showed VACTERL anomalies. Forty-five of the 50 (90%) experimental embryos (gestational days 10.5 to 14) showed notochord abnormalities. Abnormal ventral branches from the notochord toward the gut were a commonly observed abnormality. These were seen to impinge on the developing foregut, midgut, dorsal aorta, and kidney. In situ hybridization for Shh showed that these branches from the notochord expressed Shh in 66.6% of experimental embryos. This abnormal Shh expression was not seen in the control embryos.

CONCLUSIONS

Adriamycin diffusely induces altered notochord morphology in the rat embryo. The abnormal notochord morphology may allow ectopic expression of Sonic Hedgehog, and, thus, contribute to the malformations found in the VACTERL association.

Cell death in the early adriamycin rat model

The adriamycin rat model (ARM) exhibits many features of the VACTERL association. Adriamycin is a cytotoxic drug used in cancer chemotherapy. Although its exact mode of action is not clear, it is presumed to have a similar cytotoxic role in the developing embryo. Lysotracker red (LT) is a dye that stains phagolysosomes and apoptotic bodies and allows entire rodent embryos to be stained for apoptosis. We hypothesised that there was increased cell death in adriamycin-exposed embryos. To investigate this hypothesis, adriamycin (1.75 mg/kg) was given intraperitoneally to rats on days 7, 8, and 9 of pregnancy. A control group was given saline on the same schedule. Embryos were recovered at 3, 12, 24, and 48 h following the last dose and also at term (21 days) to confirm that the usual incidence of congenital anomalies found in the ARM was obtained in our animal model. Embryos were embedded in resin, sectioned, and studied by light microscopy. Embryos from the 3-h and 24-h groups were studied using LT and confocal microscopy to search for evidence of apoptosis. All term newborns (100%) from the adriamycin-treated group demonstrated the typical abnormalities found in the ARM, i.e., oesophageal atresia, multiple gastrointestinal atresias, vertebral malformations, absent tails, ureterohydronephrosis, etc. In the 9.5-day adriamycin group there was no difference in appearance between the experimental and control embryos. Specifically, no cellular debris or increased cell turnover indicative of adriamycin cytotoxicity was observed in the experimental group. At day 10.5, 90% of embryos from two separate litters had evidence of notochordal distortion and tethering to the gut or gut-tube abnormalities. These findings were not observed in the control embryos. Confocal microscopy and LT examination of the embryos from litters killed at 3 and 24 h following the last dose of adriamycin demonstrated no evidence of increased cell death in adriamycin-exposed embryos compared to control embryos. The absence of significant apoptosis in the developing embryos in the immediate period following administration of adriamycin suggests that the teratogenic effect of adriamycin is not caused by cell death.

Midgut atresias result from abnormal development of the notochord in an Adriamycin rat model

BACKGROUND/PURPOSE

Prenatal exposure to Adriamycin in a rat model (ARM) has been reported to lead to a spectrum of tracheoesophageal and associated malformations of the gastrointestinal tract, including multiple intestinal atresias. An abnormal relationship of the notochord with the foregut has been implicated in the formation of esophageal atresias. The authors hypothesised that midgut atresias arise from abnormal notochord development in the region of the midgut. This study was designed to examine the gut-notochord relationship during early embryonic development.

METHODS

Timed pregnant Wistar rats were given 1.75 mg/kg of Adriamycin intraperitoneally on days 7, 8, and 9 of gestation. Embryos were recovered at 12-hour intervals from days 9.5 to 14, and at term. A control group was given saline instead of Adriamycin. Embryos were embedded in resin or wax, sectioned, and studied using light microscopy, paying particular attention to the notochord and surrounding structures.

RESULTS

The notochord appeared identical in controls and experimental embryos on day 9.5. However, on day 10.5 the notochord was diffusely abnormal in ARM, distorted, and tethered to foregut as well as midgut compared with controls. This abnormality was not seen in control embryos. On day 12 the notochord abnormalities were more exaggerated in the region of the midgut in ARM embryos. Full-term ARM animals had esophageal and multiple intestinal atresias.

CONCLUSIONS

The notochord is abnormal in the region of the developing midgut, and this may account for the occurrence of atresias found in this region.

Conservative management of appendix mass in children

BACKGROUND

The management of an appendix mass in children is controversial. An experience of conservative management of appendix masses in a paediatric population over the last 19 years is reviewed.

METHODS

The medical records of all children who presented with an appendix mass to one of three children's hospitals between 1982 and 2000 were reviewed. In that interval 427 children with a mean age of 7.3 years (range from 2 months to 18 years) presented with an appendix mass. Sixteen children had an immediate appendicectomy. The remaining 411 children were treated conservatively by close observation and antibiotics, with intravenous fluids and nasogastric suction if required. Once the child was well enough for discharge home, elective appendicectomy was booked for 4-6 weeks later.

RESULTS

Three hundred and forty-six (84.2 per cent) of the children responded to initial conservative management and were discharged after a median stay of 6 (range 3-24) days. The children returned 4-6 weeks later for elective appendicectomy. The complication rate for elective appendicectomy was 2.3 per cent (eight patients). Those who had an uncomplicated elective appendicectomy had a median hospital stay of 3 (range 1-6) days. Histological examination demonstrated acute or subacute inflammation in 50.8 per cent of appendices removed at elective appendicectomy.

CONCLUSION

Non-operative management of an appendix mass followed by elective appendicectomy is a safe and effective method of management.

Intestinal neuronal dysplasia: results of treatment in 33 patients

PURPOSE

Intestinal neuronal dysplasia (IND) is a disease of the enteric nervous system, which clinically resembles Hirschsprung's disease. The authors reviewed their experience of IND over an 8-year period.

METHODS

Between 1992 and 1999, 418 patients underwent rectal suction biopsy for persistent constipation. Thirty-three (7.8%) patients had histologic evidence of IND. There were 26 boys and 7 girls (age range, 1 week to 10 years). The diagnosis of IND was based on the presence of hyperganglionosis of the submucous plexus and giant ganglia and at least one of the following features in rectal biopsies: (1) ectopic ganglia, (2) increased acetylcholinesterase (AChE) activity in the lamina propria, and (3) increased AChE nerve fibers around the submucosal blood vessels. All patients were started on laxatives with or without enemas after the diagnosis was made. Patients have been followed up from 1 to 8 years (mean, 2.4 years).

RESULTS

Twenty-one (64%) patients had a good response to conservative management and currently have normal bowel habits. Twelve patients (36%) underwent internal sphincter myectomy after failed conservative management. Seven of these patients now have normal bowel habits. Two patients are able to stay clean with regular enemas. Three patients who continued to have persistent constipation after myectomy and underwent resection of redundant and dilated sigmoid colon now have normal bowel habits.

CONCLUSION

The majority of patients with IND can be treated successfully with conservative treatment.