What is the most likely diagnosis of this lesion?

A 12-year-old girl has complained of sudden onset of severe pain in her left knee that has awakened her from sleep on several occasions during the past 6 weeks. For each episode, her mother has given her acetylsalicylic acid (aspirin), and the pain has been relieved. On physical examination, there are no remarkable findings. A radiograph of the left knee shows a well-defined, 1-cm lucent area surrounded by a thin rim of bony sclerosis located in the proximal tibial cortex. The patient undergoes curettage of the lesion, and the pain does not recur.
1. Enchondroma
2. Ewing sarcoma
3. Fibrous dysplasia
4. Giant-cell tumor
5. Osteoblastoma
6. Osteochondroma
7. Osteoid osteoma
8. Osteosarcoma

Asked by Bond, Last updated: Apr 19, 2024

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1 Answer

John Smith

Answered Sep 09, 2016

Osteoid osteoma-(g) this patient has an osteoid osteoma, a benign tumor of the bone that occurs in children and young adults. paindisproportionate to the size of the tumor is characteristic. if such a lesion is larger than 2 cm, it is classified as anosteoblastoma. it can be treated effectively by curettage. the acute pain is mediated by release of prostaglandins, soaspirin is an effective analgesic. an enchondroma is a benign tumor of hyaline cartilage that arises in the medullary spacein young adults. ewing sarcoma is a diaphyseal lesion composed of primitive, small, round blue cells. fibrous dysplasia isa localized area of developmental arrest of bone formation. a giant-cell tumor is a benign but locally aggressive lesion thatarises in the epiphysis of the long bones of young adults and has a soap bubble radiographic appearance. an osteochondroma is a projection of the cartilaginous growth plate to form an exostosis. an osteosarcoma is an infiltrative,destructive metaphyseal lesion.bp7 765766bp8 812pbd7 12931294pbd8 12241225