title: Recurrent parosteal osteosarcoma of the talus in a 2-year-old child.
abstract: Parosteal osteosarcoma is an uncommon, low-grade malignant bone tumor and is found in an older age group than conventional osteosarcoma. We present a talar parosteal osteosarcoma that recurred twice in a 2-year-old child. To our knowledge, this is the youngest patient reported with a parosteal osteosarcoma. The talus is an unusual site for parosteal osteosarcoma. Inadequate resection due to a diagnosis of juxtacortical chondroma resulted in recurrence of the tumor. The age of the patient, the thick cartilaginous cap, and well-differentiated trabecular bone all contributed to the critical erroneous diagnosis.
authors.affiliation: Department of Radiology, Catholic University Medical College, Kangnam St. Mary's Hospital, Seocho-Ku, Seoul, South Korea.
authors.forename: W H
authors.initials: WH
authors.lastname: Jee
authors.forename: B Y
authors.initials: BY
authors.lastname: Choe
authors.forename: I Y
authors.initials: IY
authors.lastname: Ok
authors.forename: J M
authors.initials: JM
authors.lastname: Kim
authors.forename: Y J
authors.initials: YJ
authors.lastname: Choi
authors.forename: K H
authors.initials: KH
authors.lastname: Choi
authors.forename: K S
authors.initials: KS
authors.lastname: Shinn
mesh_terms: D001859:Bone Neoplasms / Q000175:diagnosis / Q000453:epidemiology*; D002675:Child, Preschool; D003937:Diagnosis, Differential; D005260:Female; D006801:Humans; D008279:Magnetic Resonance Imaging; D009364:Neoplasm Recurrence, Local; D018217:Osteosarcoma, Juxtacortical / Q000175:diagnosis / Q000453:epidemiology*; D013628:Talus / Q000473:pathology*