Tumor mass surrounded the transverse colon in the epigastric region. A. Enhanced computed tomography (CT) showed internal content was homogenous, and only its margins were contrast-enhanced (arrow). B. Enhanced magnetic resonance imaging (MRI) showed only the margins were enhanced (arrow head). C. Colonoscopy revealed an ulcerated lesion in the transverse colon and the ulcer base was dark brown due to the adherence of iron from the patient’s medication. D. The resected specimen showed a tumor which had initially developed in the transverse colon, had infiltrated the ileum.