Obscure gastrointestinal bleeding (OGIB) is bleeding of unknown origin after a negative initial or primary colonoscopy and upper endoscopy result. Small bowel bleeding accounts for 5% of GI bleeding but it is the most prominent cause of OGIB. We present a case with an obscure diminutive polypoid vascular anomaly of small intestine. In this case, intraoperative enteroscopy seems to be the last trump card for OGIB, especially for large amount loss of blood. It not only helped to find the obscure cause for bleeding, but also preserved the small intestine.