[A case of jejunal malignant melanoma diagnosed by enteroscopy and pre-operative biopsy].

We report a case of 72-year-old man found to have a primary malignant melanoma in the jejunum. The patient was noted to be anemic and had lower abdominal pain on his visit to the Department of Gastroenterology. However, an upper gastrointestinal series and colonofiberscopic examination revealed no abnormalities. After clinical examinations, the radiological workup, which included CT, X-ray of the small intestine and single-balloon enteroscopy, revealed an intraluminal polypoid tumor, with a patchy light gray and black pattern. Pre-operative biopsy specimens revealed a malignant melanoma. Segmental intestinal resection with regional lymph node dissection was performed. The tumor size was 7.0×9.5×5.8cm. Nodal metastasis was seen only in the mesenteric node draining from the tumor-bearing intestinal segment (stage IIIa). Adjuvant chemotherapy with dacarbazine, nimustine hydrochloride and vincristine sulfate was performed, and the patient was able to recover his level of activity of daily living for 6 months.