title: An unusual case of cystic chondroblastoma of the patella.
abstract: An unusual case of chondroblastoma of the patella is presented in which the dominant feature was a hemorrhagic cyst. The chondroblastoma was located in a small gritty mass at one pole of the cyst, which could have easily been overlooked.
mesh_terms: D000328:Adult; D001845:Bone Cysts / Q000175:diagnosis; D001859:Bone Neoplasms / Q000175:diagnosis* / Q000473:pathology; D002804:Chondroblastoma / Q000175:diagnosis* / Q000473:pathology; D006801:Humans; D008297:Male; D010329:Patella