骨样骨瘤的X线、CT和MRI表现和诊断价值

目的分析骨样骨瘤的X线、CT和MRI表现，评价它们的诊断价值。方法经手术病理证实，同时有X线、CT和MRI检查的骨样骨瘤22例，其中男19例，女3例。分析X线、CT和MRI对瘤巢和瘤巢周围改变的显示能力。结果X线、CT和MRI分别有17、22和20例表现为有一圆形或卵圆形小于2cm的瘤巢，瘤巢周围可有程度不一的骨质硬化、骨膜反应、软组织及骨髓腔水肿或相邻关节的肿胀。X线诊断的准确率为77.3%（17/22）；CT诊断的准确率为100%（22/22）；MR诊断的准确率为90.9%（20/22）。结论大多数的骨样骨瘤具有较典型的影像学表现，易于诊断，其中以CT对瘤巢的定位最为准确，单凭X线或MR的表现可因未能显示瘤巢而误、漏诊。

Appearances and Diagnostic Value of X-ray,CT and MR Imaging in Osteoid Osteoma

Objective:To analysis the appearances and to evaluate the diagnostic value of X-ray CT and MR imaging in osteoid osteoma.Methods:22 cases 19 females and 3 males of osteoid osteoma proved by surgical pathology and their X-ray,CT and MRI were reviewed.The ability of X-ray,CT and MRI to demonstrate the nidus and surrounding reaction were analyzed.Results:The nidus were appeared as round or oval shape and the diameter was less than 2 cm.It was fomd in 17 cases of X-ray film,22 CT and 20 of MRI .There were different degree of bone sclerosis,periosteal reaction and soft tissues or bone marrow edema around the nidus.The diagnostic accuracy was 77.3% for X-ray,100% for CT and 90.9% for MRI.Conclusion:Most of osteoid osteoma have the typical appearances and is no difficult to make diagnosis.CT scan is the most accuracy method to demonstrate the nidus.It is possible to make misdiagnosis only with X-ray or MRI for the case that the hidus not be demonstodted.