頭蓋底軟骨腫の2例

Two Cases of Basal Chondroma

Ⅰ．はじめに

　頭蓋および頭蓋内に発生する軟骨腫は，まれな腫瘍であり，頭蓋底部に好発する．源発性頭蓋底軟骨腫の本邦における報告は，現在までに文献例13例^{1,6,8,10-12,17-19,22,23）}，学会報告例7例をみるにすぎない．

　今回われわれは，動眼神経の単独麻痺を呈した左傍鞍部軟骨腫，および外転神経の単独麻痺を呈した右錐体骨尖部軟骨腫の2症例を報告し，過去の報告例中，臨床症状，検査所見などの記載のある81例（欧米66例，本邦15例）と自験例2例をあわせた83例の分析をとおして，頭蓋底軟骨腫の臨床症状，診断につき，若干の考察を加える．

Chondromas arising from the skull or intracranial structures are very rare. Their incidence is approximately 0.1 - 0.2% of all intracranial tumors. Chondromas are classified into several groups according to their site in the skull. Those which arise from the base of the skull are the major group and, up to date, 81 such cases have been reported. We have encountered two cases of basal chondroma presenting isolated oculomotor or abducens nerve paralysis.

<CASE 1>

A 24-year-old woman was admitted to our hospital with seven months history of diplopia and ptosis in her left eyelid.