Osteoid Osteoma

• benign bone lesion
• younger than 30 age group
• painful, classically relieved with Aspirin
• long bones
• reactive sclerotic area with lucent center, vascular nidus (enhances on CT)
• nidus can calcify
• difficult to distinguish from osteomyelitits (plain film, CT, and MRI)
• Nuclear Medicine: double-density sign (increased uptake in reactive sclerosis and nidus)
• link