ascoma

例句：

1. 1. The patienthad a brain tumor that caused vision problems.
   患者患有一个导致视力问题的脑肿瘤。
2. 2.The ascoma was removed successfully duringsurgery.
   手术成功切除了视神经瘤。
3. 3.The ascoma is a rare typeof brain tumor that can cause severe visionloss.
   视神经瘤是一种罕见的大脑肿瘤，可能导致严重的视力丧失。