Upper lumbar spondylolysis: report of two cases.
D000293:Adolescent; D006801:Humans; D008159:Lumbar Vertebrae / Q000000981:diagnostic imaging*; D008297:Male; D008887:Military Medicine; D011859:Radiography; D013168:Spondylolisthesis / Q000000981:diagnostic imaging*; D013169:Spondylolysis / Q000000981:diagnostic imaging*