periosteal reaction
C2CEFR level
92/100Rarity: very rare
TechnicalRegister
New bone formation at the periosteum in response to injury, infection or tumour.
An aggressive, sunburst periosteal reaction raised concern for osteosarcoma.
Rarity runs from 0 (a word everyone knows) to 100 (almost never seen outside specialist or literary writing). Level is the word's real difficulty on the CEFR scale, from A1 to C2.
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