脑原发淋巴瘤的MRI分析

目的：分析脑原发淋巴瘤的MRI影像学表现特征，以加强对该肿瘤影像学表现的认识。方法：对经病理证实的11例脑原发淋巴瘤的临床和MRI资料进行回顾性研究，分析肿瘤的部位分布、形态和肿瘤的信号特征。结果：11例肿瘤中，顶叶4例，额叶3例．胼胝体及透明隔区3例，眼球及海绵窦区1例。全部肿瘤呈实质性肿块，7例T1WI呈稍低信号．T1WI呈稍高信号；4例T1WI和T2WI呈等信号；增强后11例肿瘤均呈明显均匀性强化。结论：脑原发淋巴瘤多起源于脑实质和胼胝体区．肿瘤通常没有囊变和坏死，增强后呈明显强化是其特征。

MRI Analysis of Primary Brain Lymphoma

Objective:To explore MR imaging characteristics of primary brain lymphoma so as to enhance under- standing of its characteristics.Methods:The clinical and MRI data of eleven patients with primary brain lymphoma confirmed by surgical pathology and biopsy were analyzed retrospectively.The location,morphology and signals of the lesions were studied.Results:Of eleven patients,four tumors were found in the parietal lobes,3 in the frontal lobes,3 in the corpus callosum and pellucid septum regions,and 1 in the eye ball and cavernous sinus.All the tumors were solid masses without cystic change and necrosis.Tumors were mild hypointense on T_1-weighted images and hyperintense on T_2-weighted images seen in 7 patients,isointense on T_1-weighted and T_2-weighted images seen in 4 cases,all tumors were strikingly enhanced after administration of contrast medium.Conclusion:Primary brain lymphoma is uncommon cerebral tumor.The characteristics of these tumors usually are hypo- or isointense on T_1-weighted images and iso- or mild hyperintense on T_2-weighted images,and remarkably enhanced with no cystic degeneration and necrosis.