Abstract
Gastrointestinal stromal tumors (GISTs) of mesenchymal origin may affect any part of the gastrointestinal tract. These tumors are incidentally discovered during endoscopic or radiological investigations, as the clinical manifestations are usually nonspecific. Factors determining prognosis include size, location, number of mitotic figures per high-power field, and tumor rupture. We present the case of an otherwise healthy young man who was brought to our emergency room following a syncopal episode and developed bloody diarrhea en route. The aim is to highlight the need for emergency surgery once diagnosed, as the bleeding is usually massive, recurrent, and life-threatening.