Malghem J, Maldague B, Labaisse M A, Dooms G, Duprez T, Devogelaer J P, Vande Berg B
Department of Radiology, Louvain University, St-Luc University Hospital, Brussels, Belgium.
Radiology. 1993 May;187(2):483-7. doi: 10.1148/radiology.187.2.8475295.
Sequential radiographic and magnetic resonance (MR) imaging examinations were performed in nine patients with an intravertebral vacuum cleft indicative of avascular necrosis. Progressive changes in the content of the cleft occurred within an hour after the patients were placed in a supine position. Initially, the cleft showed a gaslike pattern during extension of the spine, with a radiolucent band on radiographs and a signal void on MR images. Later, the vacuum phenomenon disappeared on radiographs, and a fluidlike high-signal-intensity pattern appeared on T2- or T2*-weighted MR images, suggestive of a slow fluid inflow within the intravertebral cleft. Because the recognition of a vacuum cleft in a collapsed vertebral body helps avoid confusion with malignancy or infection, it is important to search for this in examinations performed immediately after supine positioning.
对9例有提示缺血性坏死的椎体内真空裂隙的患者进行了系列X线和磁共振（MR）成像检查。患者仰卧位后1小时内，裂隙内容物出现渐进性变化。最初，在脊柱伸展时裂隙呈现气体样表现，X线片上为透亮带，MR图像上为信号缺失。之后，X线片上真空现象消失，T2加权或T2*加权MR图像上出现液体样高信号表现，提示椎体内裂隙有缓慢的液体流入。由于识别塌陷椎体中的真空裂隙有助于避免与恶性肿瘤或感染相混淆，因此在仰卧位后立即进行的检查中寻找此表现很重要。
