上顎歯肉に生じた未分化癌の頸部リンパ節転移巣に悪性黒色腫が混在していた1例

• Published in: 日本口腔外科学会雑誌 Vol. 67; no. 4; pp. 228 - 232
• Main Authors: 岸本, 恵実, 三谷, 泉, 天野, 利香, 齋藤, 泉, 長谷川, 巧実, 明石, 昌也
• Format: Journal Article
• Language: Japanese
• Published: 社団法人 日本口腔外科学会 20.04.2021
• Subjects: 悪性黒色腫; 未分化癌; 自然消退; 衝突転移
• ISSN: 0021-5163; 2186-1579
• DOI: 10.5794/jjoms.67.228

The histopathology of metastatic lesions are usually the same as primary lesions in malignant tumors. We report a rare case of malignant melanoma that was mixed with a cervical lymph node metastatic lesion of undifferentiated cancer occurring in the maxillary gingiva. The patient was referred to our department because of pain in the area of the maxillary anterior teeth. After confirmation of undifferentiated cancer by biopsy, a right partial maxillectomy and extended supraomohyoid neck dissection were performed. Histopathological examination revealed that the primary lesion was undifferentiated cancer and the metastatic lesion was malignant melanoma. We suggested the possibility that a malignant melanoma of unknown primary origin and the undifferentiated cancer in the maxillary gingiva metastasized to the same cervical lymph node as a collision tumor.