osteosarcoma
C1CEFR level
75/100Rarity: rare
TechnicalRegister
A malignant bone-forming tumour, most common in adolescents.
An adolescent with a painful knee mass and a sunburst pattern on X-ray 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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