A Case of Solitary Small Intestinal Metastasis of Malignant Melanoma Presenting With Bowel Obstruction: A Case Report.

Solitary small-intestinal metastasis of malignant melanoma is rare. If curative intent resection surgery for small intestinal metastasis can be performed, then a good prognosis can be expected. A 49-year-old woman underwent resection for malignant melanoma of the upper extremity 17 months previously and was admitted to our hospital with vomiting as the main complaint. A tumor causing bowel obstruction of the small intestine was detected, and we diagnosed a solitary small intestinal tumor using positron emission tomography computed tomography (PET-CT). Suspecting a high possibility of solitary malignant melanoma metastasis, we performed a laparoscopic resection for the small intestine and confirmed the absence of abdominal dissemination. The pathological diagnosis was small intestinal metastasis of malignant melanoma. The combination of PET-CT and laparoscopic surgery is useful for the preoperative identification of solitary small intestinal metastasis, and complete resection is possible, with a good prognosis achievable.