A 40-year-old man was referred to our hospital for examination of a hypervascular small mass in the pelvic small intestine incidentally noted on abdominal CT. Small bowel capsule endoscopy revealed an elevated lesion in the pelvic small intestine that was suspected to be a subepitherial lesion (SEL). Transanal small bowel endoscopy showed a 20 mm SEL in the ileum. Although histological diagnosis was not obtained, surgical operation (partial ileal resection) was done because gastrointestinal stromal tumor could not be denied from the imaging findings. The histological examination revealed as ectopic pancreas (Heinrich type I). The diagnostic and therapeutic strategy of SEL in the small intestine should be carefully considered.
