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はじめに
耳下腺腫瘍の発生率は頭頸部腫瘍全体の約4%で,人口10万人中に2人程度といわれる1)。副耳下腺腫瘍の発生率は耳下腺腫瘍の1〜7.7%2,3)であり,臨床の場で遭遇する機会はさらに少ない。今回,49年前に局所麻酔下に右側頰部腫瘍摘出術を受け,数年後には再発を自覚したが,悪性腫瘍ではないと告知されていたため放置していた男性に対し手術する機会を得た。手術では,初回の手術瘢痕と周囲皮膚を併せて切除したことから,頰部中央に40×50mm大の皮膚欠損が生じた。局所回転皮弁のDufourmentel皮弁4)(以下,D皮弁)を利用して即時再建した。術中所見と摘出標本の病理診断から,腫瘍は副耳下腺多形腺腫の再発と確定された。以下に症例を報告し,本邦の副耳下腺腫瘍再発症例に関して得られた若干の知見をまとめる。
An 89-year-old man who underwent surgery for a mid-cheek subcutaneous tumor 49 years prior and had a recurrence of the tumor several years later but had not been treated, visited our department. Details of the initial surgery were unknown except that it was performed under local anesthesia and that the tumor was declared benign. We resected the skin with the tumor. After resection, a 40×50 mm defect remained in the mid-cheek region. Excellent cosmetic repair was achieved using a Dufourmental flap. The structure of the excretory duct was confirmed in a section of the excised specimen;therefore, the tumor was diagnosed as a recurrent accessory parotid gland tumor.
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