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はじめに
唾液腺導管癌(salivary duct carcinoma:SDC)は全唾液腺腫瘍の約10%を占め,高齢者,男性,耳下腺に好発する高悪性度の腫瘍である。組織学的に乳管癌に類似し,明瞭な核小体と類円形の核,および好酸性の細胞質を有する腫瘍細胞が篩状構造や乳頭状・充実性の増殖パターンを示すのが特徴である。組織学的亜型として肉腫様亜型,富粘液亜型,浸潤性微小乳頭亜型などがあるが,稀ながらラブドイド様亜型を示すことがある1)。今回,われわれはラブドイド形質を伴う唾液腺導管癌(salivary duct carcinoma with rhabdoid features:SDCRF)を経験したので報告する。
A 77-year-old man presented with a right submandibular mass. A 25-mm ill-defined mass with swelling of the cervical lymph nodes was observed in the right submandibular region. Fine-needle aspiration cytology revealed Class Ⅲ. One month later, right submandibular adenomectomy and cervical lymph-node dissection were performed. The pathological diagnosis was salivary duct carcinoma with rhabdoid features(SDCRF). No recurrence or metastasis was observed at the 10-month follow up. SDCRF was first reported in 2014, and 21 cases have been reported till date. Owing to its rarity, immunohistochemical and genetic analyses are important.
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