原发性中枢神经系统淋巴瘤MRI表现

目的探讨原发性中枢神经系统淋巴瘤（PCNsL）的MRI表现特征。方法回顾性分析经病理证实的4例PCNSL患者的MRI表现，所有患者均行MR平扫及增强扫描。结朵1例术前误诊为脑膜瘤，2例位于幕上，1例位于幕下，1例同时生长于幕上及幕下。4例肿瘤边缘均可见明显分叶或浅分叶。所有病灶实质内均未见钙化。T1WI以等、稍低信号为主，T2WI序列以等或稍高信号，3例周围水肿较轻、1例水肿明显。3例病灶信号均匀、1例信号不均。增强扫描后所有病灶均匀明显强化，3例呈明显团块状或斑片状均匀强化，1例出现“脑膜尾”征。结论PCNsL的MRI表现具有一定特点，当脑内肿瘤明显分叶，周围水肿较轻，信号较均匀，并明显均匀团块状或斑片状强化时，结合临床可以对原发性中枢神经系统淋巴瘤作出诊断，具有很高的诊断价值。

MRI to Display of Primarily Central Ner- vous System Lymphoma

Objective To summarize the imaging features of primarily central nervous system lvmphoma （PCNSL）. Methods Four patients with PCNSL proven histopathologi- cally were collected. All cases had MP, data. The imaging features and pathological results were retrospectively analyzed. Resu//~ 1 case were misdiagnosed as meningeoma at pre- operation. 3 cases above the tentorium, 1 cases beneath the tentorium and 1 cases growing around the tentorium. 4 cases presented mulfilobtdar shape. Calcification not to see for all cases. TI WI showed most with isointense or shght low signals. T2WI showed most with isointense or slight high signal. 3 cases to shght of peripheral edema, 1 cases dropsy obviously, homoge- neous in 3 cases and heterogeneous in 1 C：LSes. Strong enhanced was found in all cases. 3 cases were enhanced unifomfity to gobbet or patching ＂Dural tail＂ was found in 1 cases. Con- clusions PCNSL has some specific M1LI features. Sublobe obviously in intracranial tumor, dropsy lightly, signal unifornfitv and enhanced uniformity to gobbet or patching. To diagnose PCNSL and diagnostic v：flue very supernal.