title: The os in os appearance in the spine and pelvis of adults.
abstract: Three cases of radiodense lines contained within bone and coursing parallel to the bony surfaces in skeletally mature patients are discussed. These lines were found to be distinct with normal appearing bone on either side and formed a miniature model of the present bony structure. This "bone within a bone" appearance was discovered on roentgenograms of patients with no history of musculoskeletal disorders. This radiologic finding probably represents a time-limited insult to the immature skeleton and appears to have no clinical significance.
authors.affiliation: Tulane University School of Medicine, New Orleans, Louisiana.
authors.forename: J C
authors.initials: JC
authors.lastname: Butler
authors.forename: C
authors.initials: C
authors.lastname: Simon
mesh_terms: D000328:Adult; D001846:Bone Development; D006801:Humans; D008297:Male; D008875:Middle Aged; D010388:Pelvis / Q000033:anatomy & histology / Q000000981:diagnostic imaging*; D011859:Radiography; D013131:Spine / Q000033:anatomy & histology / Q000000981:diagnostic imaging*