Osteoid osteoma

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[edit] Discussion

  • Osteoid osteoma is a small, painful, benign bone tumor that occurs most frequently during the first 3 decades of life (90% of patients are younger than 25 years).
  • Osteoid osteoma is usually fewer than 2 cm in diameter, which distinguishes it from an osteoblastoma.
  • Osteoid osteoma has a male predominance and a male-to-female ratio of at least 2:1.
  • Most common location of osteoid osteoma is the proximal femur. Tumors in the tibia and femur account for 50% of occurrences, but virtually any bone can be affected.

  • Typical symptom is local pain that is described as severe, sharp (knifelike), boring, typically worse at night, and typically relieved with salicylates.

[edit] Imaging Findings

[edit] Plain film

  • A circular or ovoid lucent defect is seen in 75% of patients. This defect is usually smaller than 1.5 cm in diameter and is associated with a variable degree of cortical and endosteal sclerosis.

[edit] CT

  • CT allows for precise localization of the nidus.
  • The nidus enhances with intravenous contrast.
  • The nidus shows a variable degree of mineralization, which may be amorphous, punctate, ringlike or uniformly dens.
  • Reactive sclerosis around the nidus varies from extremely dense to no reaction at all.

[edit] Images

Patient #1

[edit] See Also

[edit] External Links

[edit] References