A 21 yrs old patient came to OPD with complaints of swelling around knee joint

A 21 yrs old patient came to OPD with complaints of swelling around knee joint which gradually increase till 18 yrs of age and then since 2 yrs swelling size remain of same size , clinician ordered x-ray of knee joint…what will be the most probable diagnosis. a) Osteochondroma. b) Chondroblastoma. c) Chondrosarcoma.

Ans A