title: A case of malignant melanoma simultaneously found in the lung and small intestine.
abstract: Metastatic melanoma in the small bowel is a common cause of secondary intestinal tumors. We present a case of a 77-year-old man with melena resulting from melanoma in the small bowel that was simultaneously found with malignant melanoma in the lung. Abdominal contrast-enhanced computed tomography (CT) and position emission tomography (PET) revealed a 30 × 20 mm hypervascular lesion in the small bowel and a 9 × 9 mm right lobe lung mass with metastasis in the mediastinal and peritoneal lymph nodes, and the spleen. The bowel and lung tumor lesions were confirmed by enteroscopy and bronchoscopy, respectively, and were histologically diagnosed as malignant melanoma. In cases of small bowel malignant melanoma, an extraintestinal origin should always be suspected because intestinal melanomas are almost always metastatic. PET/CT is an effective tool for confirming intestinal melanomas because of its high sensitivity and specificity.
authors.affiliation: Division of Gastroenterology, Kizawa Memorial Hospital, 590 Shimofurui, Furuimachi, Minokamo, Gifu, 505-8503, Japan.
authors.forename: Takayuki
authors.initials: T
authors.lastname: Nakagawa
authors.affiliation: Division of Gastroenterology, Kizawa Memorial Hospital, 590 Shimofurui, Furuimachi, Minokamo, Gifu, 505-8503, Japan.
authors.forename: Yoichi
authors.initials: Y
authors.lastname: Yasuda
authors.affiliation: Division of Gastroenterology, Kizawa Memorial Hospital, 590 Shimofurui, Furuimachi, Minokamo, Gifu, 505-8503, Japan.
authors.forename: Seiji
authors.initials: S
authors.lastname: Sugiyama
authors.affiliation: Division of Gastroenterology, Kizawa Memorial Hospital, 590 Shimofurui, Furuimachi, Minokamo, Gifu, 505-8503, Japan.
authors.forename: Kensaku
authors.initials: K
authors.lastname: Yoshida
authors.affiliation: Division of Gastroenterology, Kizawa Memorial Hospital, 590 Shimofurui, Furuimachi, Minokamo, Gifu, 505-8503, Japan.
authors.forename: Hirokazu
authors.initials: H
authors.lastname: Adachi
authors.affiliation: Department of Pharmacology, Gifu University Graduate School of Medicine, 1-1 Yanagido, Gifu, Gifu, 501-1194, Japan. osawa-gif@umin.ac.jp.
authors.forename: Yosuke
authors.initials: Y
authors.lastname: Osawa
authors.affiliation: Division of Pathology, Kizawa Memorial Hospital, 590 Shimofurui, Furuimachi, Minokamo, Gifu, 505-8503, Japan.
authors.forename: Kengo
authors.initials: K
authors.lastname: Matsunaga
authors.affiliation: Division of Gastroenterology, Kizawa Memorial Hospital, 590 Shimofurui, Furuimachi, Minokamo, Gifu, 505-8503, Japan.
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Sugiyama
keywords: Lung malignant melanoma; Position emission tomography; Small bowel metastasis