Rectal Hematoma Mimicking as a Gastrointestinal Stromal Tumor: An Atypical Endoscopic Ultrasound Finding

Acute gastrointestinal bleeding (GIB) represents a frequently encountered condition that prompts individuals to seek urgent medical attention at the emergency department, often leading to subsequent hospitalization. GIB can range from self-limited bleeding to hemorrhagic shock. Multiple etiologies contribute to the occurrence of GIB. In this report, we present the case of an 84-year-old male with multiple medical comorbidities admitted with hemodynamically stable lower GIB. Colonoscopy demonstrated a submucosal mass without evidence of bleeding. He subsequently underwent an endoscopic ultrasound (EUS) with sonographic findings concerning for a gastrointestinal stromal tumor. However, pathological analysis from both colonoscopy and EUS indicated the presence of blood, but no evidence of malignancy. A follow-up EUS performed two months later showed a complete resolution of the previously observed submucosal mass, suggesting that the initial evaluation was likely a hematoma that has resolved completely.