原发性脑淋巴瘤的影像诊断

目的分析免疫功能正常患者原发性脑淋巴瘤影像诊断。方法回顾性分析5例免疫功能正常，经病理证实的原发性脑淋巴瘤CT、MR和PET所见。结果肿瘤可发生于幕上或幕下，可单发或多发。CT扫描多表现为等密度或稍高密度肿块，T

Imaging Diagnosis of Primary Brain Iymphoma

Objective:To describe the imaging findings of primary brain lymphoma in immunologically normal patients.Methods:The clinical manifestations and imaging findings of 5 patients operated with pathological proved primary brain lymphoma were reviewed.Results:In 5 cases,4 patients were men and one was woman.The median age was 47(range 34 to 63 years).Pathological diagnosis was compatible with primary non-Hodgkins lymphoma of brain for all five patients.Primary brain lymphoma may be soiltary or mutiple and locate at supratentorial or infratentorial.Lesions presented as an isodense to hyperdense on CT scan,hypointense on T_1-weighted images and isointense or hyperintense to gray matter on T_2-weighted images.Most lesions showed dense homogenous enhancement on CT and MR.Tumors associated with different degrees of mass effect.One patient received whole-body 18 FDG PET examination that presented as an intracranial hypermetabolic lesion.Conclusion:Primary brain lymphoma is a rare tumor that imaging findings overlap with those of other intracranial mass lesions,we can only make a suggestive diagnosis of primary brain lymphoma and pathological confirmation is meeded.