精巣全体を占有する巨大類表皮嚢胞の1例

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65歳男性.患者は左陰嚢部の無痛性腫脹を主訴とした.腫瘍マーカーは全て正常範囲内で,超音波にて腫大した左精巣を認め,精巣は内部不均一な高エコー像を呈した.以上より,精巣悪性腫瘍を疑い,左高位精巣切除術を施行した.その結果,摘出標本は7.5×4.7×3.6cm大で,病理組織学的には精巣全体を占める類表皮嚢胞であった.術後より約1年経過現在,再発転移は認められていないA case of a giant epidermoid cyst of the testis is presented. A 65-year-old man was incidentally pointed out to have left scrotal painless swelling. Physical examination revealed an over hen-egg sized enlargement of the left scrotal contents. Ultrasonography revealed a 7.5 X 5.5 X 4.0 cm solid tumor with heterogeneous echogenicity. No other abnormal findings were observed including tumor markers. Since preoperative examination did not rule out malignancy, we performed left high orchiectomy. Pathological diagnosis was a epidermoid cyst of the testis with a small portion of atrophic testis. Although the preoperative diagnosis of testicular epidermoid cyst is possible, it may be considerably difficult when a giant epidermoid cyst is occupying the testis.
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