鞍区胶质瘤的MRI诊断

MRI diagnosis of sellar glioma

目的探讨鞍区胶质瘤的MRI特点及临床发病特点。方法经手术病理证实的鞍区胶质瘤7例,回顾性分析其MRI表现。结果鞍区胶质瘤在MRI上的表现有以下特点:①肿瘤体积较大,分叶状,多无瘤周水肿;②囊实性或实性,囊性部分常位于肿瘤前下部,实性部分内多见散在小囊变区;③T1WI上肿瘤呈稍长或长T1信号,T2WI上呈稍长和长T2信号,增强后肿瘤明显强化。此外,患者就诊时多有眼部症状,而无下丘脑及垂体内分泌异常症状。结论鞍区胶质瘤具有比较典型的MRI特点,结合其临床发病特点,有助于提高术前正确诊断率。

Objective To investigate the MRI findings and clinical features of sellar glioma. Methods The MRI findings of 7 patients with sellar glioma, proved by operation and pathology, were reviewed. Results The MRI characteristics of sellar glioma were as follows： （1） The volume of tumor was comparatively large, multilobulated in shape, and rare with edema. （2） The lesions were cystic-parenchyma. The cystic part was located in anteroinferior part of the tumor while the parenchyma were often observed in the region of cystic degeneration. （3） The tumors appeared to be slight hypo- or hypo-intensity on T1-weighted images and slightly hyper- or hyper-intensity on T2- weighted images, and usually enhanced markedly after contrast-enhanced scanning. In addition, patients often suffered from visual disturbances and lacked of hypothalamic and pituitary disfunction. Conclusion MRI of sellar glioma has characteristics, which may improve the diagnostic rate before operation in combination with clinical features.