osteoid osteoma

• M:F 2:1, 5 - 25 y/o (90%) (50% 10-20)
• pain at night - prostaglandin E2
• pain responds to salicylates
• tx: surgical excision of nidus, rare spontaneous regression

• location
  • metadiaphysis and metapysis of long bones(73%)
  • spine (14%)
  • hands and feet (12%)

• lucent nidus with thickened cortex on CT and plain film
• Perinidal bone marrow edema and soft tissue inflamation on MRI

• DDx:
  • Brodie abscess
  • Ewing sarcoma
  • osteosarcoma
  • sclerosing osteomyelitis

© 2002, C.E. Kahn, Jr.
2002-04-18