颅底软骨肉瘤的CT和MRI诊断

目的 分析颅底软骨肉瘤的CT和MRI表现，探讨CT和MRI的诊断价值和限度。资料与方法搜集经病理组织学证实的12例颅底软骨肉瘤，均行CT及MRI平扫。其中8例行MRI增强扫描。结果 11例CT上可见不同程度的钙化，MRTlWI呈低等信号，T2WI呈不均匀高信号；1例CT表现为囊性低密度，伴有高密度点状出血灶，T1WI呈以低信号为主夹杂高信号出血灶，T2WI呈均匀高信号，边界清晰。8例MRI增强扫描均表现为不均匀强化，信号及密度改变与病理相符。结论 颅底软骨肉瘤的CT和MRI表现与病理相符。CT和MRI是诊断颅底软骨肉瘤的有效方法。

CT and MRI Diagnosis of Chondrosarcoma at Cranial Base

Objective To analyze CT and MRI features of chondrosarcoma at cranial base, and to evaluate CT and MRI in its diagnosis by comparing imaging signs with pathological findings.Materials and Methods Twelve patients with pathologically proved chondrosarcoma at cranial base were collected. Plain CT and MRI were performed in all patients, and additional enhanced MRI was done in 8 patients. Imaging findings were analyzed.Results Calcification of different degree was seen in 11 patients on CT scans, which displayed as low or iso signal on T 1WI and inhomogeneous high signal on T 2WI. The remaining case showed low density cystic lesion and high density spotted hemorrhage, which presented as low signal mixed with high signal on T 1WI and homogeneous high signal on T 2WI. Heterogeneous enhancement was seen in all 8 cases receiving enhanced MRI. Changes in signal and density were in agreement with pathological results.Conclusion CT and MRI signs can reflect the pathology of basicranial chondrosarcoma, therefore, CT and MRI are useful imaging modality for its diagnosis.