title: A 9-year-old girl with swelling and pain in the leg.
abstract: The following case is presented to illustrate the roentgenographic and clinical findings of a condition of interest to the orthopedic surgeon. Initial history, physical findings, and roentgenographic examinations are presented on this page. The final clinical and roentgenographic differential diagnoses are presented on the following pages.
authors.affiliation: Beijing Ji Shui Tan Hospital, People's Republic of China.
authors.forename: Z
authors.initials: Z
authors.lastname: Yang
authors.forename: L A
authors.initials: LA
authors.lastname: Gilula
authors.forename: P L
authors.initials: PL
authors.lastname: Schoenecker
mesh_terms: D001859:Bone Neoplasms / Q000000981:diagnostic imaging* / Q000601:surgery; D002648:Child; D002804:Chondroblastoma / Q000000981:diagnostic imaging* / Q000601:surgery; D005260:Female; D006801:Humans; D007085:Ilium; D011859:Radiography