骨瘤的MRI表现及其与病理对照分析

MRI Features of Osteoma Correlation with Pathologic Findings

目的探讨骨瘤的MRI影像特征及其与病理间的关系,提高对骨瘤MRI特征的认识。资料与方法14例经病理证实的骨瘤,均行MRI平扫及增强扫描,着重分析其MRI强化特征并与病理结果对照。结果(1)骨瘤多呈类圆形,边缘清晰,无软组织肿块和骨膜反应;(2)9例骨瘤T1WI、T2WI均呈低信号,Gd-DTPA增强扫描轻度强化6例,无强化3例,病理上9例均为成熟骨板和纤维组织,其中6例有大量骨母细胞,包括1例位于大腿根部肌间隙内的骨外骨瘤,呈轻度强化,病理上含有成熟的哈氏系统;(3)5例呈均匀或不均匀长T1、长T2信号,Gd-DTPA增强扫描呈不均匀轻度强化4例,明显强化1例,病理上除成熟骨板和纤维组织外,均有多少不一的骨髓成分,明显强化的1例含有较多的扩张毛细血管。结论对于典型骨瘤病例,MRI具特征性表现;对于增强扫描强化较明显的病例,尚需依赖病理确诊。

Objective To discuss the correlation between MRI findings and the pathological features of osteoma in order to improve diagnostic accuracy.Materials and Methods MR findings of 14 cases with osteoma confirmed by pathology were analyzed respectively.Results （1） 14 tumors were rounded,sharply outlined,and no soft-tissue mass and periosteal reaction.（2） 9 cases had hypointensity signal on T1WI and T2WI,and 6 cases showed slightly enhancement and 3 not enhanced which were consist of mature osseous lamella and fibroustissue,and consist of plenty of osteoprogenitor cells,including 1 case located in intermuscular septum at the root of left thigh which slightly enhanced with mature haversian system.（3） 5 cases were homogeneous （1/5）or inhomogeneous（4/5） long T1 and long T2 signals,there were inhomogeneous slightly（4/5） or remarkable（1/5） enhancement in which various components of bone-marrow observed,and meanwhile 1 case of the remarkable enhancement containing a large quantity of ectatic capillaries.Conclusion For the typical case,MRI has characteristic features. For those with remarkable enhancement,the accuracy of diagnosis still depend on pathology.