A multidisciplinary approach to management of abdominal lymphatic malformations

Abdominal Lymphatic Malformations: A Novel Approach in Management

AIM OF THE STUDY

Abdominal lymphatic malformations (LM) are a challenging clinical entity. Complete excision can be impossible due to the infiltrative nature of some lesions and high rate of complications. Sclerotherapy may require multiple episodes of general anaesthesia and an inability to be definitive in terms of diagnosis and treatment. Subsequently we have adopted a newer algorithm of treatment involving a joint procedure with interventional radiology to enable an intra-operative treatment plan based on the findings. We present our early results.

METHOD

A retrospective observational study in a single tertiary paediatric centre from January 2019 to December 2023. The details of each patient were recorded along with their treatment pathway and outcome.

RESULTS

12 children underwent treatment for abdominal LM. Under GA and laparoscopic vision, pigtail catheters were inserted into the lesion to effect maximal drainage and assessment of surgical anatomy. If resection was feasible this was undertaken through a laparotomy and if not, the drains were retained and sclerotherapy was started. Three underwent drainage with sclerotherapy without resection and 9 underwent drainage with resection. Of the 3 who underwent sclerotherapy 2 have had further treatment and remain under review at a mean follow up of 7.6 months. Of the other 9 there were no signs of recurrence of the LM at a mean follow up of 29 (range 6-56) months.

CONCLUSION

We have found a combined procedure involving IR-guided drainage under laparoscopic vision enabling curative surgical resection to be undertaken, where feasible, with currently no significant morbidity. For those in whom this is not possible then direct intralesional sclerotherapy is the next most useful treatment modality for longer term control of symptoms.

LEVEL OF EVIDENCE

II.

Short-term Postoperative Complications of Lymphatic Malformation Surgical Excision: A 20-Year Institutional Review

OBJECTIVE

To evaluate outcomes and postoperative complications following surgical resection of lymphatic malformations (LMs) at a single multidisciplinary vascular anomalies center.

METHODS

A single-center retrospective review of all patients ≤21 years old who underwent surgical resection of a lymphatic malformation at a quaternary referral center with a multidisciplinary vascular anomalies team from 2004 to 2024. Data pertaining to postoperative outcomes and treatments was abstracted.

RESULTS

A total of 109 surgical procedures were included and examined. The most common 30-day postoperative complications included: seroma (18.3 %), superficial surgical site infection (18.3 %), and wound dehiscence (12.8 %), with lower rates of nerve palsy/injury (5.5 %), lymphedema (2.8 %), hematomas (3.7 %), and abscesses (4.6 %). An interventional radiology procedure within 30-days postoperatively was required for management of seroma in 8 patients (7.3 %), while 7 (6.4 %) patients required reoperation. Among patients who underwent attempted complete resection, recurrence of the LM was documented in 32.0 % (16/50). Subjective quality of life improvement was noted in 69.7 %. There was no difference in incidence of postoperative complications reported in patients who underwent preoperative sclerotherapy vs those that did not (p = 0.980).

CONCLUSION

Seroma and surgical site infection were the most reported short-term postoperative complications followed by wound dehiscence with low rates of other complications in surgical resection of LMs. Few patients required postoperative procedural intervention. Despite a relatively high rate of short-term complications, patients reported high satisfaction and symptom improvement following LM resection, which underscores the important role for surgical management of LMs in select patients.

LEVEL OF EVIDENCE

III.

TYPE OF STUDY

Cohort study.

Abdominal lymphatic malformations in children: case series

Lymphatic Malformations (LMs) are benign congenital malformations of the lymphatic system that commonly involve the abdomen in children (mesentery of the small intestine and omentum). The management of these malformations is not unique. 7 children with different ages (range: newborn to 14 years), diagnosis was incidental in some cases, while in others for abdominal pain. All patients underwent abdominal ultrasound and Magnetic Resonance Imaging (MRI). Laparoscopy for diagnosis was useful in 4 cases. Treatment was: conservative in 1 child, laparoscopic excision in 3 patients, laparotomic excision in 3 cases. At follow up we observed recurrence in a case that required integrated treatment and bowel occlusion after excision in 1 case. This benign malformations may not cause any symptoms to patient. The goal of treatment is to maintain organ function, preserve aesthetic integrity and complications control. Management of these patients could be varied: the best approach should be evaluated on the basis of the patient.

Management and Outcomes of Pediatric Lymphatic Malformations: A Systematic Review From the APSA Outcomes and Evidence-Based Practice Committee

BACKGROUND

Significant variation in management strategies for lymphatic malformations (LMs) in children persists. The goal of this systematic review is to summarize outcomes for medical therapy, sclerotherapy, and surgery, and to provide evidence-based recommendations regarding the treatment.

METHODS

Three questions regarding LM management were generated according to the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA). Publicly available databases were queried to identify articles published from January 1, 1990, to December 31, 2021. A consensus statement of recommendations was generated in response to each question.

RESULTS

The initial search identified 9326 abstracts, each reviewed by two authors. A total of 600 abstracts met selection criteria for full manuscript review with 202 subsequently utilized for extraction of data. Medical therapy, such as sirolimus, can be used as an adjunct with percutaneous treatments or surgery, or for extensive LM. Sclerotherapy can achieve partial or complete response in over 90% of patients and is most effective for macrocystic lesions. Depending on the size, extent, and location of the malformation, surgery can be considered.

CONCLUSION

Evidence supporting best practices for the safety and effectiveness of management for LMs is currently of moderate quality. Many patients benefit from multi-modal treatment determined by the extent and type of LM. A multidisciplinary approach is recommended to determine the optimal individualized treatment for each patient.

LEVEL OF EVIDENCE: 4

Operative Management of Intra-abdominal Lymphatic Malformations in Children: A Single Tertiary Center Experience

BACKGROUND

Intra-abdominal lymphatic malformations (LMs) are relatively rare congenital anomalies and can be divided into intra- and retroperitoneal subgroups. This study aims to evaluate the outcomes after surgical resection of intraperitoneal LMs in children.

METHODS

The records of all patients ≤16 years of age with intraperitoneal LMs managed at our tertiary center between 2007-2022 were reviewed. Patients with retroperitoneal LMs were excluded. Our preferred approach is surgical exploration for large (>5 cm), symptomatic lesions if they are potentially resectable on imaging.

RESULTS

A total of 12 patients (10 males) were diagnosed with intraperitoneal LMs located in the small bowel mesentery or omentum at a median age of 6.6 (range, 0.6-14.4) years. Ten (83%) patients presented with acute symptoms, including abdominal pain (n = 8; 67%) and vomiting (n = 3; 25%). Two (17%) intraperitoneal LMs were found on imaging performed for other reasons. Surgical exploration was performed in 11/12 (92%) cases. Intestinal volvulus around a mesenteric macrocyst had occurred in 4 (36%) patients. Complete macroscopic resection was achieved in 10/11 (91%) patients. Most lesions were localized to a short intestinal segment. One mixed type LM with an extensive mesenteric involvement was biopsied as the lesion was deemed to be unresectable in preoperative imaging and the diagnosis was initially unclear. There was one recurrence (8%) during postoperative follow-up on imaging (median 3.6 (range, 1.5-6.9) years) but the patient has remained asymptomatic and not undergone interventions. 6/8 (75%) of screened intraperitoneal LMs were positive for a somatic PIK3CA mutation.

CONCLUSIONS

Most large, pedunculated macrocystic LMs in the small bowel mesentery or omental location were amenable to macroscopic resection. Intraperitoneal LMs tend to present with acute symptoms including a risk for intestinal volvulus based on anatomical location. Our results suggest low recurrence rates or need for further interventions over follow-up.

LEVEL OF EVIDENCE

III.

Laparoscopic-assisted sclerotherapy in pediatric retroperitoneal lymphatic malformations

Background

Retroperitoneal lymphatic malformations (LMs) are rare. Currently, the treatment of retroperitoneal LMs remains challenging. This study aimed to examine the safety and efficacy of laparoscopic-assisted sclerotherapy for retroperitoneal LMs in pediatric patients.

Methods

We retrospectively reviewed patients treated with laparoscopic-assisted sclerotherapy for retroperitoneal LMs in a single tertiary medical center between July 2020 and February 2023. Doxycycline was prepared into a solution with a concentration of 10 mg/ml for use in sclerotherapy. Demographic data, clinical features, details of management, and outcomes were collected and analyzed.

Results

A total of six patients, comprising three males and three females, were identified. The LMs were categorized into four macrocystic and two mixed-cystic types. The mean age and weight were 52.2 months (range, 11-108 months) and 20 kg (range, 12.5-27.5 kg), respectively. Three patients presented with abdominal pain or distension, while the other three patients were asymptomatic. All six patients underwent a total of eight sclerotherapy sessions. Two patients experienced intra-cystic hemorrhage and required a second sclerotherapy session. Only one patient presented with vomiting after sclerotherapy, which resolved spontaneously. Five patients met the complete response criteria, and one patient met the effective criteria. The mean reduction in lesion size was 92.3% (range, 69.9%-99.6%). No further complications or recurrence were recorded during follow-up.

Conclusion

Laparoscopic-assisted sclerotherapy is a safe and effective approach for treating retroperitoneal LMs. This technique is applicable for both macrocystic and mixed-cystic retroperitoneal LMs.

Mesenteric and omental lymphatic malformations in children: seven-year surgical experience from two centers in China

PURPOSE

To compare the clinical characteristics, surgical management and prognosis of mesenteric lymphatic malformations (ML) and omental lymphatic malformations (OL) in children.

METHODS

This retrospective study included 148 ML patients and 53 OL patients who underwent surgical treatment at two centers between January 2016 and December 2022. Details about the patients' clinical characteristics, cyst characteristics, preoperative complications, surgical methods, and prognosis were retrieved and compared.

RESULTS

No significant differences in sex ratio, prenatal diagnosis, or age of diagnosis were noted between ML and OL patients. Vomiting was more common in ML patients than in OL patients (46.6% vs. 22.6%, P = 0.002), but OL patients were more likely to be misdiagnosed (35.8% vs. 18.9%, P = 0.012). The size of the cysts in OL patients was significantly larger than that in ML patients (14.0 [4.0-30.0] vs. 10.0 [2.0-50.0] cm, P<0.001), and cysts with turbid fluid were more common in OL patients (38.0% vs. 20.6%, P<0.001). More OL patients than ML patients had preoperative hemorrhage or infection of cysts (41.5% vs. 31.8%, P<0.016). Cyst excision was performed in 137 (92.6%) ML patients and 51 (96.2%) OL patients, and the incidence of postoperative complications was lower (12.6% vs. 4.2%, P = 0.165) among OL patients. The main postoperative complications included adhesive ileus and recurrence of cysts. Additionally, more OL patients than ML patients were treated with laparoscopic surgery (69.8% vs. 39.2%, P<0.001).

CONCLUSIONS

There were differences in clinical characteristics, cyst characteristics and preoperative complications between ML and OL patients. Cyst excision was the most common surgical method that was used to treat both ML and OL patients, and laparoscopic surgery could be a feasible surgical approach for treating OL patients with a good prognosis.

TRIAL REGISTRATION

Retrospectively registered.

Institutional Management of Abdominal Lymphatic Malformations: Evolution of Treatment Over a Decade

INTRODUCTION

Abdominal lymphatic malformations (LM) have been historically managed with surgical resection; however, sclerotherapy and sirolimus have emerged as effective therapies. The purpose of our study is to evaluate our institutional change in management and outcomes for abdominal LM over the past decade.

METHODS

A retrospective cohort study was performed for all children with an abdominal LM managed at our multidisciplinary Vascular Anomalies Center from 2011 to 2020. Patient demographics, symptoms, treatment, treatment response, and complications were analyzed with descriptive statistics.

RESULTS

Twenty-nine patients with abdominal LM were identified with a median age at treatment of 6 y (interquartile range 3-14). A majority of lesions were identified as macrocystic (n = 18, 62%). The most common intervention was surgery alone (n = 14, 48%) followed by sirolimus alone (n = 4, 14%), and sclerotherapy + sirolimus (n = 4, 14%). Five patients were observed due to lack of symptoms at presentation. Prior to 2017, 91% (10/11) of LM were treated with surgery alone. Following 2017, only 31% (4/13) were treated with surgery alone. Sixty-seven percent (16/24) of treated patients had >95% reduction in LM maximum diameter. A majority of patients (23/24) who received treatment had improvement or resolution of symptoms at median 9-mo follow-up. Only three patients had post-treatment complications, including a drain site infection, small bowel obstruction, and an aspiration event. Complications only occurred after sclerotherapy sessions.

CONCLUSIONS

Over the study period, our institution has transitioned to initial management of symptomatic abdominal LM with sclerotherapy and/or sirolimus with almost all treated patients having excellent or satisfactory treatment response. Post-treatment complications were rare.

Tumor or Inflammatory Myofibroblastic Reaction in an Adolescent With an Abdominal Lymphatic Malformation?

We report the case of a 17-year-old male who presented with intractable nausea and vomiting. Cross-sectional imaging revealed a large retrogastric abdominal mass. Fine needle aspiration done via endoscopic ultrasound (EUS) was nondiagnostic. Exploratory laparotomy revealed a large inflammatory mass densely adherent to the stomach and retroperitoneum. Incisional biopsy frozen section revealed spindle cells, and subsequent resection of the mass with en-bloc subtotal gastrectomy with Roux-en-y gastrojejunostomy reconstruction was performed. Final pathology demonstrated a lymphatic malformation with reactive myofibroblastic proliferation. Inflammatory abdominal lymphatic malformations are especially rare and not well described in the literature. These masses may present diagnostic challenges until the specimen is sent for pathologic analysis.