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billy 10-30-2012 10:22 AM

Billy Step 1 Questions # 62
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. What is the most likely diagnosis of this lesion?

□ (A) Enchondroma
□ (B) Ewing sarcoma
□ (C) Fibrous dysplasia
□ (D) Giant-cell tumor
□ (E) Osteoblastoma
□ (F) Osteochondroma
□ (G) Osteoid osteoma
□ (H) Osteosarcoma

venky2600 10-30-2012 10:25 AM

good question

i'll go with G) osteoid osteoma


vaibhavmanu 10-30-2012 10:30 AM

G) osteoid osteoma

rupesh 10-31-2012 02:21 AM

buzz word given her acetylsalicylic acid (aspirin), and
the pain has been relieved>>>>>osteoid osteoma

billy 10-31-2012 03:07 AM

G is correct
This patient has an osteoid osteoma, a benign tumor of the bone that occurs in children and young adults. Pain
disproportionate to the size of the tumor is characteristic. If such a lesion is larger than 2 cm, it is classified as an
osteoblastoma. It can be treated effectively by curettage. The acute pain is mediated by release of prostaglandins, so
aspirin is an effective analgesic. An enchondroma is a benign tumor of hyaline cartilage that arises in the medullary space
in young adults. Ewing sarcoma is a diaphyseal lesion composed of primitive, small, round blue cells. Fibrous dysplasia is
a localized area of developmental arrest of bone formation. A giant-cell tumor is a benign but locally aggressive lesion that
arises 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

Casandra 10-31-2012 01:00 PM

my answer :)
(G) Osteoid osteoma

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