颅内软骨瘤的CT、MRI诊断

目的总结探讨颅内软骨瘤的CT、MRI特点。方法对1994年1月至2004年9月经手术病理证实的10例颅内软骨瘤的CT、MRI特点进行回顾性分析。结果10例中，肿瘤位于颅底4例，大脑凸面4例，大脑镰区、脑实质内各1例；CT上均见到明显的钙化且边缘清楚，密度多不均匀（9例），相邻骨质可受累（5例）；于MRI上呈混杂信号（4例），其中钙化部分呈长T1、短T2信号，实质部分呈等长T1、长T2信号；CT增强扫描出现轻度强化4例，其中3例为延迟强化。结论颅内软骨瘤好发于颅底、大脑凸面及大脑镰区，多数伴有明显钙化，增强扫描呈轻度强化，延迟强化较有特点。病理仍是主要的确诊手段。

CT and MRI diagnosis of intracranial chondroma

Objective To summarize and study the features of intracranial chondroma on CT and MRI imaging. Methods CT and MRI findings of ten cases of intracranial chondroma proved by surgery and pathology from 1994. 1 to 2004.9 were retrospectively analyzed. Results Among 10 cases, 4 cases were located at the skull base, 4 cases at convexity, 1 case at the region of falx cerebri, and 1 case within the brain parenchyma. CT scans showed obvious calcification and clear border of the tumors in 10 cases, mixed attenuation in 9 cases, and adjacent bone invasion in 5 cases. 4 cases of MRI scans showed hypointense signal on T1 and T2-weighted images in calcified element of the tumor, intermediate to hypointense signal intensity on T1 -weighted image, and hyperintense signal intensity on T2-weighted image in parenchyma of the tumor. 4 cases of CT scans showed slightly enhancement. Conclusion Intracranial chondroma are often originated from synchondrosis of the skull base, convexity of brain and region of falx cerebri. Obvious calcification may be seen in most cases. Slightly enhancement and marked delayed contrast enhancement were characteristic. The accurate diagnosis still depends on pathology.