桥小脑角区胆脂瘤的磁共振弥散加权成像

Role of MR-diffusion weighted image in diagnosing cholestentoma in cerebellopontine angle

目的探讨MR-DWI检查对桥小脑角胆脂瘤的诊断价值。方法回顾性分析我院13例经手术和病理证实的桥小脑角区胆脂瘤患者的磁共振平扫、增强和DWI图像的特征。结果所有病变均以累及桥小脑角为主,病灶为类圆形或不规则形,沿蛛网膜下腔生长,7例包埋基底动脉。平扫8例以与脑脊液一致的长T1WI、长T2WI为主,5例为混杂信号;病灶无强化及灶周水肿;DWI典型表现为病灶范围内高信号。结论桥小脑角的胆脂瘤在MR-DWI图像上有特征表现。MR-DWI检查有助于桥小脑角区胆脂瘤的诊断和鉴别诊断。

Objective Toexplore Role of MR-diffusion weighted image in diagnosiag cholestentoma in cerebellopontine angle（CPA）. Methods 13 palents with cholestentoma proved by surgical and pathological examination were retrospectively reviewed with their data cnllected from plain and enhanced scan of MRh and DWl. Results All lesions mainly involved CPA, displaying subround or irregular shapes, running along subarachnoid space. Basilar arteries were encapsulated in 7 lesions, 8 cholestentomas that underwent plain scan showed long T2WI and long T1WI signal similar to CSF in intensity. 5 lesions showed confounding signals, free from enhancement of lesions and edema around lesions. Hyperintensity within area of lesion was characteristic for DWI Conclusion Cholestentorna in CPA shows characteristic manifestations on MR-DWI, enabling it to be diagnosed and differentiated.