巨大前頭葉腫瘍2症例の視機能の経過

Visual outcome in two cases of giant frontal lobe tumor

　視力障害から巨大な嗅窩部髄膜腫が発見された2症例を経験した。症例1は60歳男性，9×7×5cmの腫瘍があり，初診時右眼無光覚，左眼光覚弁であった。症例2は47歳女性，7×7×6cmの腫瘍があり，初診時視力右眼（0.7），左眼（0.2）であった。眼底検査により症例1では右視神経乳頭の軽い退色と左乳頭の軽い発赤が，症例2では両視神経萎縮がみられた。それぞれ2回に分けて1／2から2／3の腫瘍が部分摘出された。術後，症例1では視力右眼50cm指数弁，左眼（0.01），症例2では右眼（0.9），左眼（0.9）と改善した。良性の巨大前頭葉腫瘍の場合，部分摘出術であっても視機能の回復が期待でき，視力回復の可能性があることが示された。

We treated two cases of giant olfactory groove meningioma. The chief complaint was visual impair-ment. In the first case, a 60-year-old male, the initial visual acuity was null right and light perception left. The tumor size was 9cmx7cmx5cm. The right optic disc was slightly pale and the left was hyperemic. In the second case, a 47-year-old female, the corrected visual acuity was 0.7 right and 0.2 left. The tumor size was 7cmx 7cmx6cm. The optic disc was atrophic in both eyes. Partial removal of the tumor, about 1/2 to 2/3 in volume, was performed in two stages in both cases. The corrected visual acuity after surgery was 50 cm finger counting right and 0.01 left in the first case and 0.9 left in either eye in the second. The visual outcome was much better than initially expected. These cases illustrate that visual recovery is possible in cases of giant benign frontal lobe tumor even when the initial visual acuity is null.