目的分析良性成骨细胞瘤的影像学表现。方法收集经手术病理证实的5例发生于脊椎外的良性成骨细胞瘤,其中男4例,女1例,年龄20～50岁,平均28岁。5例均摄有病变部位正侧位平片,3例有CT检查,1例有MR检查。结果5例中,发生于跟骨者2例,距骨者1例,腓骨者1例,髌骨者1例。X线表现:2例呈局灶性骨质破坏,边界清晰;1例呈膨胀性改变,边缘有硬化,其内密度不均;1例略呈囊状膨胀性骨质破坏;1例病变呈溶骨性破坏,边界欠清。CT检查:2例病变呈均匀低密度,其内无钙化及骨化,无硬化边,增强扫描病变有中度强化,其中1例伴有病理性骨折;1例呈外生囊状膨胀性生长,有花边样硬化边,其内可见点、片状高密度影。MRI检查:病变主体位于骨皮质内,边界清晰,T1WI呈均匀低信号,T2WI呈等低信号,增强扫描明显强化。结论脊椎以外成骨细胞瘤影像无明显特征性,容易误诊,CT对其影像学细节征象的显示有较大优势。 Objective To analyze the imaging findings of benign osteoblastoma. Methods Five patients with benign osteoblastoma, including 4 males and 1 females, aged 20-50 years (average 28 years old) with pathologically confirmed spondylitis were collected. 5 cases were taken lesions were lateral plain film, 3 patients with CT examination, 1 case of MR examination. Results In 5 cases, 2 cases occurred in the calcaneus, 1 in the talus, 1 in the fibula and 1 in the patella. X-ray showed: 2 cases showed focal bone destruction, the border is clear; 1 case showed swelling changes, the edge of the hardening, the inner density is uneven; a case of cystic dilatation of bone destruction; 1 case was Osteolytic destruction, the border is not clear. CT examination showed that two lesions showed a uniform low density with no calcification and ossification, no sclerosis, moderate enhancement of enhanced scanning lesions, of which 1 was accompanied by pathological fracture and 1 was exostosis cystic dilatation , With lace-like sclerosis, which can be seen inside, high-density sheet shadow. MRI examination: The lesion was located in the cortical bone, with clear boundary, uniform low signal on T1WI, low signal on T2WI, and significant enhancement on enhanced scan. Conclusions The imaging of osteoblastoma outside the spine has no obvious characteristic and is easily misdiagnosed. CT has a great advantage in displaying the imaging detail signs.