Radiologic diagnosis of osteoid osteoma: from simple to challenging findings.
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.
Chai
Jee Won
JW
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.
Hong
Sung Hwan
SH
Choi
Ja-Young
JY
Koh
Young Hwan
YH
Lee
Joon Woo
JW
Choi
Jung-Ah
JA
Kang
Heung Sik
HS
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*