title: Radiologic diagnosis of osteoid osteoma: from simple to challenging findings.
abstract: Osteoid osteoma is characterized by an intracortical nidus with a variable amount of calcification, as well as cortical thickening, sclerosis, and bone marrow edema. When these findings are present, a diagnosis of osteoid osteoma is easily made. However, osteoid osteoma may display imaging findings that can be misleading, and it can be difficult to differentiate osteoid osteoma from other conditions such as infection, inflammatory and noninflammatory arthritis, and other tumors. In addition, stress fracture, intracortical abscess, intracortical hemangioma, chondroblastoma, osteoblastoma, and compensatory hypertrophy of the pedicle may mimic osteoid osteoma. To make the correct diagnosis, it is necessary to identify the nidus, and it is important to be familiar with the radiologic findings of osteoid osteoma and its mimics.
authors.affiliation: Department of Radiology and Institute of Radiation Medicine, Seoul National University College of Medicine, 101 Daehang-ro, Chongno-gu, Seoul 110-744, Korea; Boramae Medical Center, Seoul, Korea.
authors.forename: Jee Won
authors.initials: JW
authors.lastname: Chai
authors.forename: Sung Hwan
authors.initials: SH
authors.lastname: Hong
authors.forename: Ja-Young
authors.initials: JY
authors.lastname: Choi
authors.forename: Young Hwan
authors.initials: YH
authors.lastname: Koh
authors.forename: Joon Woo
authors.initials: JW
authors.lastname: Lee
authors.forename: Jung-Ah
authors.initials: JA
authors.lastname: Choi
authors.forename: Heung Sik
authors.initials: HS
authors.lastname: Kang
mesh_terms: D001859:Bone Neoplasms / Q000175:diagnosis*; D003937:Diagnosis, Differential; D006801:Humans; D008279:Magnetic Resonance Imaging / Q000379:methods; D010017:Osteoma, Osteoid / Q000175:diagnosis*; D012516:Osteosarcoma / Q000175:diagnosis*; D014057:Tomography, X-Ray Computed / Q000379:methods*