[Diagnostic imaging of chondroblastoma: a radiological, pathological and postoperative analysis of 58 cases]

Imageological data of 58 cases with chondroblastoma including plain radiographs in all cases, CT scan in 10 and scintigraphy of bone in 6 proved pathologically were reviewed and analysed. 33 cases were followed-up for 1 to 20 years after operation. The authors hold that plain radiograph is still the primary approach to assessment of this disorder. Position of the disease, calcification inside the focus, scalloping sclerotic rim and periosteal new bone formation frequently seen in metaphysis near the lesion are essential X-ray appearance. CT scan has some advantages in showing fine pathological fracture of cortex, subtel calcification, scope of involvement and recurrent signs in earlier stage, whereas bone scintigraphy is non-specific. The main factors of postoperative recurrence are incomplete curettage and more active biological behaviour of the tumor itself in part of cases. And some points for diagnosing chondroblastoma with atypical X-ray manifestations were also presented.