title: Collar-type osteophyte of the femur in young adults: is it a harbinger of intra-articular osteoid osteoma?
abstract: Variable clinical and radiological findings for intra-articular osteoid osteoma (OO) of the hip joint make its diagnosis difficult. Because radiographs commonly do not identify the nidus, MR imaging becomes the second line of study. However, because the appearance varies, findings on MR images can be confusing. We found "collar type osteophyte" of the femur i.e. an osteophyte rim around the femoral neck, to be a conspicuous finding of intra-articular OO. Here, this feature will be emphasized and intra-articular OOs will be discussed, with a review of the literature.
authors.affiliation: Department of Radiology, Gulhane Military Medical Academy, Gn. Tevfik Saglam Cad. 06018, Etlik, Ankara, Turkey, tubasanal@gmail.com.
authors.forename: Hatice Tuba
authors.initials: HT
authors.lastname: Sanal
authors.forename: Yalcin
authors.initials: Y
authors.lastname: Bozkurt
mesh_terms: D000328:Adult; D001859:Bone Neoplasms / Q000150:complications / Q000175:diagnosis*; D038524:Diffusion Magnetic Resonance Imaging / Q000379:methods; D005270:Femur Head / Q000000981:diagnostic imaging* / Q000473:pathology*; D005500:Follow-Up Studies; D006621:Hip Joint / Q000000981:diagnostic imaging / Q000473:pathology; D006801:Humans; D008279:Magnetic Resonance Imaging / Q000379:methods; D008297:Male; D010017:Osteoma, Osteoid / Q000150:complications / Q000175:diagnosis*; D054850:Osteophyte / Q000150:complications / Q000175:diagnosis*; D014057:Tomography, X-Ray Computed / Q000379:methods; D055815:Young Adult