title: Chondroblastoma--two contrasting presentations.
mesh_terms: D000293:Adolescent; D002648:Child; D002804:Chondroblastoma / Q000175:diagnosis*; D003937:Diagnosis, Differential; D005266:Femoral Neoplasms / Q000175:diagnosis*; D006801:Humans; D008297:Male; D014394:Tuberculosis, Osteoarticular / Q000175:diagnosis