The MRI features of chondroblastoma with correlation of X-ray and CT findings / 中华放射学杂志

ABSTRACT

Objective To investigate the MR imaging features of chondroblastoma,and to address the correlation with findings of X-ray radiography and CT.Methods The imaging findings including MRI,X-ray radiography and CT of 16 chondroblastomas proved by surgery and pathology were analyzed and correlated with each other. Results All sixteen chondroblastomas involved the epiphyses of long bones,with varying sizes from 0.8 cm to 5.1 cm and lobulation. They were iso- and hypo-intense on T1WI and had heterogeneous signals on T2WI.They were of soft tissue density on CT,and had areas of calcifications and low density.The rims were hypointense on both T1 WI and T2 WI and showed hyperdensity on CT. The lesions were surrounded by edema of bone marrow which was hypointense on T1 WI and hyperintense on fat suppressed T2WI,while on X-Ray film and CT it was hyperdense sclerotic area.The adjacent soft tissues were swelling.Nine cases had periosteal abnormalities on MRI in which 8 of 9 periosteal abnormalities were distant from the primary lesions,and 6 of them showed hyperdense perosteal new bone on CT.Twelve cases had joint effusion on MRI and CT detected 6 of them.The lesions had heterogeneous enhancement,and there was enhancement in areas of edema within bone marrow,periosteal reaction and adjacent soft tissue.Chondroblastoma was intermediate and hyperintense on DWI,and the intermediate areas on both T1 WI and T2WI,together with areas of bone marrow edema,periosteal reaction and soft tissue swelling,were hyperintense on DWI.Conclusions The MRI,X-ray and CT can reflect the pathological changes of chondroblastoma from different aspects.The characteristics of chondroblastoma can be better appreciated by combining different imaging methods.