特发性视神经炎类似视神经鞘脑膜瘤

放射学检查证实.有视神经和视神经鞘增大而视力丧失的病人多因肿瘤和非肿瘤疾病所致,视神经胶质瘤和视神经鞘脑膜瘤是视力丧失常见的原因.高分辨力薄层CT扫描能早期发现,并可鉴别这类病变.但许多非肿瘤性病变也可有肿瘤的同样CT表现.部份病例,很难根据各种视神经病变的大小、形态和造影剂增强的特性鉴别为肿瘤性或非肿瘤性肿块.

Idiopathic inflammation of the optic nerve simulating optic nerve sheath meningioma

A case of idiopathic inflammation of the optic nerve (perioptic neuritis) which simulated optic nerve sheath meningioma is reported and the literature reviewed. In this case, idiopathic inflammation of the optic nerve caused enlargement of the nerve and its sheath, showing a tubular diffuse thickening with a central hypodense area (tram-tracking sign). thus mimickling the cancers morphology idiopathic perioptic neuritis is an important condition for, the differential diagnosis of visual loss when CT demonstrates enlargement of the optic nerve.