腰椎椎弓峡部崩裂的CT诊断：附9例报告

CT Diagnosis of Pars Defects of Lumbar spine

对９例腰椎弓峡部崩裂及脊椎滑脱症的ＣＴ表现进行了分析。结果表明ＣＴ检查对该症的诊断非常准确可靠。峡部崩裂表现为椎弓峡部锯齿状裂隙，边缘可有不规则硬化、增生或囊性变，断端向椎管内增生可使椎管形成细腰葫芦形；脊椎滑脱症表现为椎管前后径增大及椎体前缘和／或后缘双边征，椎管前后径增大数值与真正滑脱数基本一致，作者等认为，该症与椎后小关节在扫描层面高度、断端形态、密度和与椎体后缘冠状面成角等方面均有区别。ＣＴ检查在同一层面同时显示双侧椎弓断裂形态及在显示椎管内结构方面均优于Ｘ线平片。对扫描方法进行了叙述。

CT features of 9 casesof bony defects of pars interarticula-ris & spondylolysis of lumbar spinewere studie,dshowing that in diagno-sis of this condition CT is precise& reliable.Pars defects showed serra- ted edges of the bony gaps with irre-gular osteosclerotic changes,hypert-rophy or some small cyst formations Bony proliferation inward could giverise to hourglass deformity of thespinal canal.While increased antero-posterior diameter of the spinal canaland double contour of anterior orposterior edge of the vertebral bodyindicated spondylolisthesis.the valueof the increased diameter was inconformity with the degree of spondy- lolytic changes;this condition isdifferent from the normal appearanceol facet joint with respect to slicelevel,appearance of the gap,densityand angulation of the coronal poster-ior surface of the affected vertebralbody.CT is superior to plain film indepicting bilateral pars defects anddeformity of the spinal canal.Detailsof scanning method was also given