Kato Koichi, Wanifuchi Hiroshi, Watanabe Atsushi
Department of Neurosurgery, Saitama Saiseikai Kurihashi Hospital, 714-6 Kouemon, Kurihashi-machi, Kitakatsushika-gun, Saitama 349-1105, Japan.
No Shinkei Geka. 2009 Jun;37(6):573-8.
Radiosurgery for small vestibular schwannomas is an established and effective treatment, and it has been used for trigeminal schwannoma recently. Delayed cyst formation is well recognized as a complication after gamma knife radiosurgery for arteriovenous malformation. We encountered a case of delayed cyst formation after gamma knife radiosurgery for trigeminal schwannoma. An 81-year-old male presented with abducens palsy and ataxia 6 years after gamma knife radiosurgery for trigeminal schwannoma. A cyst development in the posterior fossa was identified, and the brain stem was compressed by the cyst. The cyst was removed and the abducens palsy and ataxia improved within a month. Histological findings revealed variable tumor tissue in the cyst wall. Delayed cyst formation should be recognized as a complication after radiosurgery for schwannoma.
放射外科治疗小型前庭神经鞘瘤是一种成熟且有效的治疗方法，最近也已用于三叉神经鞘瘤。延迟性囊肿形成是伽玛刀放射外科治疗动静脉畸形后公认的并发症。我们遇到了一例三叉神经鞘瘤伽玛刀放射外科治疗后延迟性囊肿形成的病例。一名81岁男性在三叉神经鞘瘤伽玛刀放射外科治疗6年后出现外展神经麻痹和共济失调。在后颅窝发现一个囊肿，脑干被囊肿压迫。囊肿被切除，外展神经麻痹和共济失调在一个月内得到改善。组织学检查结果显示囊肿壁内有不同的肿瘤组织。延迟性囊肿形成应被视为神经鞘瘤放射外科治疗后的一种并发症。
