Crescent-shaped necrosis: a new imaging sign suggestive of stromal tumor of the small bowel.

We report three cases of unsuspected stromal tumors of the small bowel (STSB). These cases were diagnosed preoperatively by sonography, the imaging was completed for some with barium studies, computed tomography, magnetic resonance imaging, or angiography. To our knowledge, the use of this noninvasive technique for detecting this type of tumor has not been described in the literature. Moreover, we believe that some sonographic findings such as crescentic tumoral necrosis may appear highly suggestive of STSB.