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case_images: Contrast-enhanced CT shows a hyper-vascularized tumor in the small bowel (white arrow).
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case_images: Contrast enhanced CT showed a hyper-vascularized tumor in the small bowel which was considered to be a bleeding location (Fig. 1).
case_images: Double-balloon endoscopy revealed an ulcerated lesion and massive bleeding from an exposed vessel.
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case_images: Subsequently, double-balloon endoscopy with an oral approach was performed and a submucosal tumor with ulcerated lesion was identified (Fig. 2).
case_images: Resected specimen showing submucosal tumor with ulcerated lesion.
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case_images: A submucosal tumor with a diameter of 14 mm x 10 mm was detected in the resected specimen, which was responsible for the massive bleeding (Fig. 3).
case_images: Significantly dilated vascular region in the submucosal layer and a mucosal inversion into the disrupted vessel were confirmed by histological examination.
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case_images: Histological examination revealed a significantly dilated vascular region in the submucosal layer and inversion of mucosa was detected at the disrupted location of the vessel (Fig. 4).