GI hemangiomas can cause bleeding, abdominal pain, and anemia

Most intestinal hemangiomas are located in the jejunum arising from the submucosal vascular plexus and often form a polypoid, intraluminal subepithelial mass, although they may occasionally appear diffuse.

CT reveals intramural subepithelial lesions with an intraluminal growth pattern. Dynamic contrast-enhanced CT images demonstrate slow diffuse enhancement, visible at the portal venous and delayed phase: accordingly with this study, these lesions could be easily missed during the arterial phase and unenhanced CT. 

In this patient previous colonoscopy and capsule endoscopy did not show clearly any GI lesion causing bleeding.