Primary omental gastrointestinal stromal tumour (GIST) presenting with a large abdominal mass and spontaneous haemoperitoneum

Laparoscopic resection for spontaneously ruptured primary extragastrointestinal stromal tumor of the greater omentum: A case report

Introduction

Ruptured extragastrointestinal stromal tumor (EGIST) are rare; therefore, there are no standard guidelines for its treatment. Herein, we report the successful laparoscopic resection of a ruptured EGIST.

Presentation of case

The patient was a 59-year-old man, a Jehovah's Witness, who presented with sudden onset of left-sided abdominal pain. Contrast-enhanced computed tomography (CECT) performed from a previous hospital revealed intra-abdominal hemorrhage. Repeat CECT at our institution revealed extravasation and serum ascites. A hematoma was found anterior to the omentum, and a tumor was detected which did not have continuity with the surrounding organs of the gastrointestinal tract. Complete tumor resection via laparoscopic surgery was performed and the specimen was sent for histopathology, which revealed bundle-like proliferation of spindle-shaped cells. Immunohistochemical staining was completed, which was positive for KIT and CD34. Based on surgical and pathological findings, the final diagnosis was extragastrointestinal stromal tumor originating from the omentum.

Discussion

EGISTs have a similar morphology to that of gastrointestinal stromal tumors, but instead, arise outside the gastrointestinal tract. A significant differentiation and key to the diagnosis of EGIST is the absence of continuity with the gastrointestinal tract. The preferred treatment for EGIST is complete surgical resection, and the use of laparoscopy has not been well studied. Postoperative histopathological examination, along with immunohistochemical staining, aid confirmatory diagnosis.

Conclusion

Laparoscopic removal of EGISTs is a minimally invasive and potentially useful technique for the management of this tumor type.

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Diagnosis and treatment of a spontaneously ruptured tumor is complicated.

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Religion restrictions in management should be respected and followed.

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First line of treatment of EGISTs is complete surgical resection.

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Laparoscopic removal of EGISTs is minimally invasive and potentially useful.

Primary Extragastrointestinal Stromal Tumor of Greater Omentum with Intraperitoneal Bleeding

Gastrointestinal stromal tumors (GISTs) develop in the digestive tract, mainly in the stomach, small intestine, colon, or esophagus. However, primary tumors with the same pathologic features as GISTs have been reported to occur outside of the digestive tract and are called extragastrointestinal stromal tumor (EGIST). We herein report a rare case of EGIST arising from the greater omentum in a patient with abdominal pain caused by intraperitoneal bleeding from the tumor.

A case of eosinophilic cholangiopathy mimicking cholangiocarcinoma

Eosinophilic cholangiopathy is an uncommon etiology of biliary stenosis, which is characterized by eosinophilic infiltration. Clinically, it is difficult to distinguish eosinophilic cholangiopathy from other causes of obstructive cholangiopathy before pathologic confirmation. We report a case of eosinophilic cholangiopathy. A 30-year-old male patient complained of right upper quadrant abdominal pain. Magnetic resonance cholangiopancreatography showed distended gallbladder and multifocal bile duct strictures with diffuse wall thickening. His bilirubin level increased continuously even after endoscopic retrograde cholangiopancreatography. He underwent laparoscopic cholecystectomy for cholecystitis and pathology of resected gallbladder revealed marked eosinophilic infiltration with no malignant component. His pain improved after cholecystectomy and multifocal bile duct strictures with wall thickening were rapidly improved after steroid therapy.

Clinicopathological features and prognosis of omental gastrointestinal stromal tumor: evaluation of a pooled case series

Clinicopathological features and prognosis of omental GISTs are limited due to the extremely rare incidence. Therefore, the aim of the present study was to investigate the clinicopathological features and prognosis of omental GISTs. Omental GISTs cases were obtained from our center and from case reports and clinical studies extracted from MEDLINE. Clinicopathological features and survivals were analyzed. A total of 99 cases of omental GISTs were enrolled in the present study. Omental GISTs occurred predominantly in greater omentum (78/99, 78.8%). The majority of tumors exceeded 10 cm in diameter (67/98, 68.3%) and were high risk (88/96, 91.7%). Histological type was correlated with tumor location and mutational status. The five year DFS and DSS was 86.3% and 80.6%, respectively. Mitotic index was risk factor for prognosis of omental GISTs. Prognosis of omental GISTs was worse than that of gastric GISTs by Kaplan-Meier analysis. However, multivariate analysis showed that the prognosis was comparable between the two groups. The majority of omental GISTs were large and high risk. Mitotic index was risk factor for prognosis of omental GISTs. The prognosis was comparable between omental and gastric GISTs.

A case of a stomach gastrointestinal stromal tumor with extremely predominant cystic formation

A 79-year-old male was referred to the hospital with a history of abdominal discomfort. Abdominal computed tomography revealed a cystic tumor with irregular wall thickness, approximately 50 mm in diameter, along the lesser curvature of the gastric body. Magnetic resonance imaging visualized the mass as signal-hyperintense on T2-weighted imaging. Esophagogastroduodenoscopy showed a submucosal tumor with normal mucosa. Surgery was performed and the 60 × 50 × 50 mm mass was resected. The resected tumor comprised cystic and solid regions; the cystic region was filled by light bloody serous fluid. On histological examination, a solid region of the resected tumor showed a spindle-cell appearance. The diagnosis was gastric gastrointestinal stromal tumor (GIST) with predominant cystic formation. GISTs are usually solitary tumors, but in this case the tumor demonstrated extremely predominant cystic formation. Lesions with a hemorrhage or necrosis may form large cystic spaces. GISTs may show extensive cystic changes in response to tyrosine kinase inhibitor treatment; however, this patient had not undergone any such treatment before diagnosis. This represents an interesting case of a gastric GIST with predominant cystic formation occupying most of the tumor volume. Care should be taken to differentiate between GISTs and actual intra-abdominal cystic lesions.