title: Intercostal myositis ossificans misdiagnosed as osteosarcoma in a 10-year-old child.
abstract: Myositis ossificans (MO) is a rare benign cause of heterotopic bone formation within soft tissue. It most commonly affects adolescents and young adults, typically in the limbs and following trauma. Very few cases have been reported in children. We report here a case of nontraumatic MO occurring in a 10-year-old girl with an uncommon location in the 5th right intercostal space; it was initially misdiagnosed and treated as osteosarcoma. Imaging findings including plain radiographs, CT, MRI, bone scintigraphy and PET-CT are described. This case highlights the central role played by imaging in diagnosis, thus avoiding biopsy that can erroneously suggest osteosarcoma as the diagnosis, as occurred in this case.
authors.affiliation: Service de Radiologie II, Hôpitaux Universitaires, Hôpital de Hautepierre, 1 Avenue Molière, 67098, Strasbourg Cedex, France. meriam.koob@chru-strasbourg.fr
authors.forename: Mériam
authors.initials: M
authors.lastname: Koob
authors.forename: Jean
authors.initials: J
authors.lastname: Durckel
authors.forename: Jean-Claude
authors.initials: JC
authors.lastname: Dosch
authors.forename: Natacha
authors.initials: N
authors.lastname: Entz-Werle
authors.forename: Jean-Louis
authors.initials: JL
authors.lastname: Dietemann
mesh_terms: D001859:Bone Neoplasms / Q000000981:diagnostic imaging; D002648:Child; D003937:Diagnosis, Differential; D003951:Diagnostic Errors / Q000517:prevention & control*; D005260:Female; D006801:Humans; D009221:Myositis Ossificans / Q000000981:diagnostic imaging*; D012516:Osteosarcoma / Q000000981:diagnostic imaging; D011859:Radiography; D012272:Ribs / Q000000981:diagnostic imaging*