GIST tumor: an unusual presentation

Abstract

Gastrointestinal stromal tumors (GISTs) account for < 3% of gastrointestinal neoplasms and are the most common mesenchymal tumors. They are more common in men > 50 years. They are benign in 80% of the cases and usually occur in the stomach and small intestine. The incidence of extragastrointestinal GISTs is unknown. A 56-year-old male patient sought medical care for abdominal pain in the right iliac fossa that appeared after exercising. The patient was a current smoker, obese, had a history of hypertension (HTN) and diabetes (DBT) and was receiving anticoagulants. A computed tomography (CT) scan showed an expansive mass within the peritoneum with peripheral enhancement. Surgical management was decided. During the procedure, a tumor was found in the mesentery. Up to 60% of these tumors are usually asymptomatic and are incidentally found in imaging tests; therefore, clinical suspicion and, most importantly immunohistochemistry, are essential for the diagnosis. CD117 is the main marker. Surgery is the treatment of choice for GISTs and chemotherapy is also indicated.