title: Osteoid-osteoma with multicentric nidus. A report of two cases.
mesh_terms: D000293:Adolescent; D001859:Bone Neoplasms / Q000473:pathology; D002648:Child; D005266:Femoral Neoplasms / Q000473:pathology; D006801:Humans; D006811:Humerus / Q000473:pathology; D008297:Male; D009378:Neoplasms, Multiple Primary / Q000473:pathology; D010017:Osteoma, Osteoid / Q000473:pathology