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I.はじめに
脈絡叢乳頭腫は全脳腫瘍の0.3-0.5%を占める比較的稀な腫瘍である.そのうち,melanin様色素産生性の悪性脈絡叢乳頭腫が数例報告されている2-4,7,8).しかし,病理組織学的に分化のよい脈絡叢乳頭腫にmelanin様色素産生がみられた例の報告はない.
われわれは,側脳室壁の一部に浸潤性に発育していたが,組織学的によく分化している脈絡叢乳頭腫の腫瘍細胞内に著明なmelanin様色素沈着を示した症例を経験し,その組織化学的および電顕的検索を行った結果を報告する.
A case of pigmented, well differentiated, choroid plexus papilloma is reported.
A 45-year-old man came to our hospital complaining of attacks of vertigo and nausea. Skull X-ray films and CT scan demonstrated a calcified tumor in the left middle fossa. Tumor removal was done, and it was found that the tumor occupied the inferior horn of the left lateral ventricle. Histological examination revealed well differentiated choroid plexus papilloma containing various shaped pigment granules in the cytoplasm. The pigment granules in the tumor cells were stained black by Fontana-Masson method for melanin.
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