A general overview of mucocele of appendix

Ovarian Causes of Pseudomyxoma Peritonei (PMP)-A Literature Review

BACKGROUND

Pseudomyxoma peritonei (PMP) is a rare, progressive, slowly growing, inadequately understood neoplasm with a 5-year progression-free survival rate of as low as 48%. It is characterized by varying degrees of malignancy and the production of mucinous and gelatinous structures. Typically, the development of pseudomyxoma peritonei is associated with the rupture of appendiceal mucinous tumors and other gastrointestinal or ovarian mucinous tumors. The goal of our literature review was to identify various aspects that characterize the ovarian causes of pseudomyxoma peritonei.

MATERIALS AND METHODS

The authors performed an extensive literature search between 1 February 2024 and 2 March 2024 on the following databases: Pubmed, Scopus, Oxford Journals, and Reaxys, and the findings were summarized into seven main clinical and paraclinical situations.

RESULTS

According to our research, the main instances in which pseudomyxoma peritonei can be triggered by an ovarian cause are the following: (1) mucinous cystadenoma; (2) mucinous ovarian cancer; (3) colon cancer with ovarian metastasis; (4) malignant transformation of an ovarian primary mature cystic teratoma; (5) appendiceal mucocele with peritoneal dissemination mimicking an ovarian tumor with peritoneal carcinomatosis; (6) mucinous borderline tumor developing inside an ovarian teratoma; and (7) the association between a mucinous bilateral ovarian cancer and a colonic tumor.

CONCLUSIONS

In our study, we aimed to provide a comprehensive overview of the ovarian causes of pseudomyxoma peritonei, including its epidemiology, imagery characteristics, symptoms, current treatment, and promising future therapies, in the hopes of finding feasible solutions, as a lack of understanding of this mucus-secreting malignant disease increases the risk of delayed diagnosis or uncontrolled deterioration.

Myxoglobulosis of the appendix presenting as acute appendicitis

Myxoglobulosis is a rare form of appendiceal mucocele characterized by mucoid material inside the appendix that resembles fish eggs. It is usually asymptomatic and diagnosed incidentally, but it can also present as a surgical abdomen, which can create a diagnostic dilemma. This case report presents a 37-year-old male patient with features suggestive of acute appendicitis. A computed tomography scan of the abdomen showed features of appendiceal mucocele. The patient underwent appendicectomy through a lower midline incision. The macroscopic finding was myxoglobulosis, and the patient had an uneventful postoperative course. The histopathology report of the appendix confirmed the diagnosis.

The value of ultrasound combined with CT in identifying early low-grade appendiceal mucinous neoplasm and appendicitis

Objective

The aim of this study is to investigate the value of ultrasound combined with computed tomography (CT) in identifying early low-grade appendiceal mucinous neoplasm and appendicitis.

Methods

Patients with early low-grade appendiceal mucinous neoplasm and appendicitis from September 2017 to September 2021, including 40 patients with low-grade appendiceal mucinous neoplasm and 40 patients with appendicitis, were collected in this study. Clinical data as well as ultrasound and CT findings of all patients were retrospectively analyzed. Univariate and multivariate logistic regression analyses were applied to establish the ultrasound model, the CT model, and the combined model.

Results

The nomogram showed that specific characteristics of CT were dilated appendiceal diameter and clear surrounding fat space in the low-grade appendiceal mucinous neoplasm and that specific characteristics of ultrasound were thin or clear layer appendix wall and flocculent echo in the appendix cavity. These four features were used to construct a nomogram for predicting early low-grade appendiceal mucinous neoplasm, and the area under the curve value was 0.839.

Conclusion

Ultrasound combined with CT for diagnosis of early low-grade appendiceal mucinous neoplasm has a significant value; when found significantly dilated appendix in the lower right abdomen, with thin wall, wall calcification, clear surrounding fat space, and progressive enhancement, especially non-specific symptoms similar to appendicitis, the physician should timely consider the possibility of low-grade appendiceal mucinous neoplasm.

А case of a mucocele of the appendix – A diagnostic and therapeutic dilemma

INTRODUCTION AND IMPORTANCE

Mucocele of the appendix is a rare pathology with an estimated incidence of less than 1 % of all appendectomies. Here is a report of a 67-year-old Bulgarian female, diagnosed with a low-grade appendiceal mucinous neoplasm (LAMN) after immunohistochemical analysis, which changed the therapeutic strategy.

CASE PRESENTATION

We present a case of a patient, initially admitted to the Gastroenterology Department due to complaints of dyspepsia and intermittent watery diarrhea. Abdominal ultrasound revealed an oval hypoechoic heterogeneous formation with mixed echo structure in the ileocecal region. Laparoscopic appendectomy with partial cecal resection was performed. The additional immunohistochemical assessments classified the finding as a LAMN with 12 % proliferative index (Ki-67), pancreatin-positive reaction in epithelial cells and CD68-positive reaction in macrophages.

CLINICAL DISCUSSION

Mucinous neoplasms of the appendix are classified on a spectrum from benign to malignant based upon certain features on histological examination. When there are signs of malignancy such as metastases in the loco-regional lymph nodes, perforation with intraperitoneal dissemination and affected base of the appendix (positive margins of resection), more aggressive approach is recommended - right hemicolectomy. Simple appendectomy is the choice for patients with benign mucocele as suggested by the presence of a normal caecum and appendicular base with no evidence of perforation.

CONCLUSION

Appendiceal mucocele could be an illustrative example of a diagnostic and therapeutic challenge due to the rarity of the disease. Pathohistological examination and mainly immunohistochemical tests are the key to correct diagnosis and treatment.

Significance of laparoscopic cytoreductive surgery for appendiceal pseudomyxoma peritonei with limited disease and low tumor burden

OBJECTIVE

To investigate the clinical value of laparoscopic cytoreductive surgery (CRS) in treating of appendiceal pseudomyxoma peritonei with limited disease and low tumor burden.

METHODS

The clinical data of patients with appendiceal pseudomyxoma peritonei treated by surgery with CRS at the Aerospace Center Hospital from January 2018 to December 2021 were retrospectively analyzed. The patients were divided into laparoscopic or open CRS groups according to the operation method. A propensity score-matched (PSM) analysis (1:1) was performed, the related clinical variables were compared between the two groups, and the effect on progression-free survival (PFS) was also analyzed.

RESULTS

One hundred and eight patients were included in this study. After PSM, 33 patients were selected from each group and the age and peritoneal cancer index were matched between the two groups. There were significant differences in operation time (P < 0.001), intraoperative bleeding (P < 0.001), intraoperative blood transfusion (P = 0.007), hospital stay (P < 0.001). The analysis of PFS showed that there was no significant difference between the two operation methods. After multivariate analysis, the pathologic subtype (P = 0.012) was identified as an independent prognostic factor for PFS.

CONCLUSION

The curative effect of laparoscopic CRS is like that of open operation, which can significantly shorten the operation time and hospital stay and reduce intraoperative bleeding and blood transfusion event. The laparoscopic CRS is safe and feasible in strictly selected patients. The pathologic subtype is an independent factor affecting the prognosis for PFS.

Large Mucocele of the Appendix Discovered in a 48-Year-Old Male Presenting With Appendicitis: A Case Report

The appendix is a vermiform-like organ that extends from the cecum and has been thought of as having a rudimentary immunologic function. However, the appendix can become distended and mucus-filled, classifying it as a mucocele appendix. Mucoceles can be found in various locations in the body, including the colon and the appendix, and have malignancy potential. We report a case of a 48-year-old male that presented to the ED with a history of two days of abdominal pain. Upon arriving at the ED, he had a CT scan showing a 9.5 x 4.2 x 6.4 cm fluid collection in the right lower quadrant (RLQ) juxtaposed to the cecum, suggesting appendicitis or an abscess. Initially, a laparoscopic approach was taken, which was then converted to an open laparotomy. The mass was excised and a right hemicolectomy was performed along with an ileocolonic anastomosis due to extensive involvement of the large intestine. Pathology reported a low-grade appendiceal mucinous neoplasm resected with negative margins and 16 negative lymph nodes.

Superinfection of an Obstructive Appendiceal Mucocele: A Case Report

Appendiceal mucocele is an uncommon entity that may arise due to benign or malignant processes. The radiologic exploration of this entity is necessary for diagnosis, and its imaging manifestations vary, with some findings being more common than others. More specifically, the radiological findings of a superinfected mucocele are rare, with few reports in the literature. Herein we present the case of a 68-year-old male patient with a superinfected appendiceal obstructive mucocele caused by a fecalith, which was diagnosed by abdominal CT evaluation.

Three cases of appendiceal mucocele: From diagnosis to management

Appendiceal mucocele is an appendicular dilatation secondary to the intraluminal accumulation of mucous material. Adequate pre-operative diagnosis and surgical resection remains the standard management. Here, we present three cases of appendiceal mucocele. In the first case, a 60-year-old female presented with signs and symptoms of acute appendicitis and was admitted and operated. An inflamed distended globular cystic mass of appendix measuring 10 × 6 × 4 cm with a wide base was found and the patient underwent right hemicolectomy. In the second case, a 30-year-old male with symptoms and signs of acute appendicitis was admitted to the emergency department. An open surgery was performed and a distended, tense, and inflamed appendix without perforation of size 6 × 1 × 1 cm was discovered and removed. The diagnosis of mucocele appendix was suspected and confirmed by postoperative dissection of the specimen and histopathology. In the third case, a 25-year-old female patient was subjected to diagnostic laparoscopy in view of non-specific pain abdomen. A diagnosis of mucocele of appendix was made intraoperatively and removed using a specimen bag. Appendiceal mucocele with acute presentation is a rare pathology that clinically resembles acute appendicitis. Preoperative detailed investigations to reach a definitive diagnosis are critical for adequate surgical resection and overall outcome.