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Retired NBME 27 Answers

nbme27/Block 4/Question#14 (reveal difficulty score)
A 9-year-old girl is brought to the emergency ...
Periosteum ๐Ÿ” / ๐Ÿ“บ / ๐ŸŒณ / ๐Ÿ“–
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submitted by โˆ—shak360(23)
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Maybe it's easier to remember that the periosteum is the implicated tissue in most bone cancers:

Raised periosteum (creating a "Codman triangle") - aggressive bone lesion (such as osteosarcoma, Ewing sarcoma, osteomyelitis)

"Onion skin" periosteal reaction - Ewing sarcoma (malignant small blue cell tumor)

Should also remember that osteoBlasts Build Bone after differentiating from mesenchymal stem cells in the periosteum.

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