Abstract A 51‐year‐old woman visited our hospital with the chief complaint of tarry stools. Contrast‐enhanced abdominal computed tomography revealed leakage of contrast medium into the lumen of the small intestine. Subsequently, a double‐balloon endoscopy was performed, which revealed a submucosal mass‐like lesion in the jejunum. Although hemostasis was attempted with clips, complete hemostasis was difficult to achieve, and angiographic embolization was performed. Nevertheless, the anemia progressed, and a small bowel resection was performed. Histopathological examination led to a diagnosis of a ruptured submucosal aneurysm of the small intestine. Endoscopic hemostasis is often difficult to achieve for submucosal aneurysms in the intestine. The submucosal tumor‐like finding observed on endoscopy in submucosal aneurysms is termed an “SMT‐like sign” and is considered an important finding to diagnose aneurysms.
