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41歳の女性で,CT上均一な高吸収値を示した類上皮腫の1例を報告した。頭痛を主訴に来院し,入院時神経学的所見に異常はなかった。CTで後頭蓋窩に二房性の境界明瞭で均一な高吸収値を示す腫瘍を認め,MRIではT1,T2強調画像ともに顕著な低信号域を示した。手術所見では小脳半球後面に薄い被膜をもつ嚢胞で内容物はmotor oil様の粘調な液体であり,組織診断は類上皮腫であった。CT上高吸収値を示す類上皮腫は稀であり,その臨床的および画像診断上の特徴について文献的考察を加え報告した。
We reported a case of epidermoid tumor with unusual findings on CT and MRI. A 41-year old woman was admitted because of headache. On admission she had no neurological deficits. CTrevealed a lobular homogenous high-dense mass with a sharp margin in the mid-portion of the posterior fossa. The mass was shown as a low signal intensity on both T1-and T2-weighted MRI. An encapsulated mass containing "motor oil" like viscid fluid was removed by surgical operation. Histological examination revealed epidermoid cyst. CT-dense epidermoid tumor was discussed with referring to the literature.
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