側頭部皮膚原発腺様囊胞癌の頸部リンパ節転移例

A case of neck metastasis of adenoid cystic carcinoma arising from the scalp

Ⅰ．はじめに

　腺様囊胞癌は唾液腺に好発する悪性腫瘍の1つである。その他，涙腺，気管支，乳腺，子宮などを発生母地とすることも知られているが，皮膚原発は稀である^1）。今回われわれは，側頭部皮膚原発の腺様囊胞癌で頸部リンパ節転移をきたした1例を経験したので報告する。

　Adenoid cystic carcinoma is a common salivary gland tumor, but rarely arises from the skin. A 74-year-old woman had been aware of a mass in her left temporal scalp for 9 years. Incision of the mass was performed by a previous physician, and histopathological diagnosis was adenoid cystic carcinoma. She underwent wide resection of the tumor followed by reconstruction with a local skin flap. Two years later, ipsilateral cervical lymph node swelling occurred, and the patient was referred to our department. Computed tomography, magnetic resonance imaging, and positron emission tomography revealed metastatic lymph nodes in the posterior and upper cervical regions. Conservative neck dissection was performed, and the histopathological examination of the surgical specimen confirmed lymph node metastasis of adenoid cystic carcinoma. The patient's postoperative course was uneventful. She has been free from disease 5 months after neck dissection.