长骨骨梗死的MRI表现及诊断价值

MRI MANIFESTATIONS OF THE LONG BONE INFARCTION AND THEIR SIGNIFICANCE IN DIAGNOSIS

目的分析长骨骨梗死的MRI表现,探讨其在长骨骨梗死早期诊断中的应用价值。方法长骨骨梗死病人10例,均行MRI检查。结果10例病人病变共累及17个部位,其中股骨下端9个,胫骨上端7个,胫骨下端1个。7例病人MRI表现符合急性骨梗死,2例符合亚急性骨梗死,1例符合慢性骨梗死。17个部位的病变均呈形态不规则、边界清楚的地图板块样改变。3例在脂肪预饱和T2WI序列上可见较明显的双边征,表现为内高外低两条并行迂曲的信号带。结论长骨骨梗死的MRI表现具有特征性,对于疑有长骨骨梗死的病人进行MRI检查,有利于早期诊断。

Objective To analyze the MRI manifestations of long bone infarction and assess the value of MRI in early diagnosis of the lesion. Methods Patients with long bone infarction （n=10） were examined by MRI. Results Seventeen different locations of infarction were found on MRI in 10 patients, including nine on the distal end of femur, seven on the proximal end of tibia, one on the distal end of tibia. Acute bone infarction was diagnosed by MRI in seven patients, sub-acute bone infarction in two,and chronic bone infarction in one. All of the MRI manifestations showed the typical map-shaped changes with irregular and clear boundaries. Three of these cases showed obvious ＂double-line＂ sign in fat presaturation T2-weighted image,with a high signal intensity line in the inner zone and a low signal intensity line in the parallel outer zone. Conclusion MRI manifestations of long bone infarction are specific, which facilitate the early diagnosis of suspected long bone infarction.