title: Bone within a bone.
abstract: The "bone within a bone" appearance is a well-recognized radiological term with a variety of causes. It is important to recognize this appearance and also to be aware of the differential diagnosis. A number of common conditions infrequently cause this appearance. Other causes are rare and some remain primarily of historical interest, as they are no longer encountered in clinical practice. In this review we illustrate some of the conditions that can give the bone within a bone appearance and discuss the physiological and pathological aetiology of each where known.
authors.affiliation: Department of Radiology, Royal Orthopaedic Hospital, Birmingham B31 2AP, UK.
authors.forename: H J
authors.initials: HJ
authors.lastname: Williams
authors.forename: A M
authors.initials: AM
authors.lastname: Davies
authors.forename: S
authors.initials: S
authors.lastname: Chapman
mesh_terms: D000755:Anemia, Sickle Cell / Q000150:complications / Q000000981:diagnostic imaging; D001847:Bone Diseases / Q000000981:diagnostic imaging*; D001851:Bone Diseases, Metabolic / Q000000981:diagnostic imaging; D001862:Bone Resorption; D001842:Bone and Bones / Q000002:abnormalities* / Q000000981:diagnostic imaging*; D003460:Crystallization; D003937:Diagnosis, Differential; D006801:Humans; D007049:Iatrogenic Disease; D009999:Ossification, Heterotopic / Q000000981:diagnostic imaging; D011859:Radiography