トルコ鞍まで進展した小脳橋角部髄膜腫の犬の一例 Cerebellopontine Angle Meningioma Expanding into the Sella Turcica in a Dog

10歳の雌のプードル犬が左眼の陥没と左側頬部筋の萎縮を呈し,次いで左側不全麻庫と前庭症状を呈した。本例のMRI検査で,左側小脳橋角部から脳底に沿ってトルコ鞍にまで達するT1強調画像で等信号,T2強調画像で等信号およびガドリニュウムで増強される腫瘤が認められた。本例は,後頭骨開頭術を行い腫瘤を摘出したが,麻酔から覚醒することなく死亡した。腫瘤の病理組織学的検査では線維型髄膜腫と診断された。

A 10-year-old, female poodle was presented with left paresis and vestibular signs, following left enophthalmus and atrophy of the cheek. Magnetic resonance imaging revealed a mass along the base of the brain and extending from the left cerebellopontine angle to the sella turcica. The mass showed isointensity on the T1-weighted image and T2-weighted image, and was enhanced by contrast medium (Gd-DTPA). Although occipital craniotomy was carried out and the mass removed, the dog died without recovering from the anesthesia. The tumor was diagnosed pathologically as fibroblastic meningioma.