An Unusual Presentation of Huge Gastric Cystic Gastrointestinal Stromal Tumor

Gastrointestinal stromal tumors (GISTs), nonepithelial, mesenchymal tumors arising from the interstitial cells of Cajal. The diagnostic tool for the GISTs is tyrosine kinase growth factor receptor (c-KIT / CD117) expression. They most commonly occur in the the stomach. Here we reported a rare case of GIST, presenting as a large cystic mass connected to the main tumor with a peduncle. A 44-year-old female patient presented to the emergency department with abdominal pain and intestinal obstruction. Emergency laparatomy revealed a cystic mass of approximately 25 cm in diameter. The pathological diagnosis was gastrointestinal stromal tumor with cystic degenaration. Tumor contained areas of necrosis, high mitotic index, c-KIT positive and was large in diameter. Cystic GISTs have poor prognostic factors and patients should be followed closely in the postoperative period.