Primary duodenal carcinoid.

Duodenal carcinoid tumors are rare. We report two patients with isolated duodenal carcinoid tumors diagnosed accidentally by endoscopy, who were not operated, and were followed for more than 2 yr without evidence of metastasis. Because duodenal carcinoid tumors are slow growing and have a relative benign course, a conservative approach is recommended in old patients with relative contraindications to surgery.