title: Pathology quiz case 2. Postirradiation sinonasal osteosarcoma.
authors.affiliation: Veterans General Hospital-Taipei, Taipei, Taiwan.
authors.forename: Chih-Chieh
authors.initials: CC
authors.lastname: Tseng
authors.forename: Ching-Zong
authors.initials: CZ
authors.lastname: Lin
authors.forename: Wing-Yin
authors.initials: WY
authors.lastname: Li
mesh_terms: D000368:Aged; D003131:Combined Modality Therapy; D005005:Ethmoid Sinus; D017809:Fatal Outcome; D005260:Female; D006801:Humans; D009303:Nasopharyngeal Neoplasms / Q000532:radiotherapy*; D009361:Neoplasm Invasiveness; D009381:Neoplasms, Radiation-Induced; D009669:Nose Neoplasms / Q000209:etiology* / Q000473:pathology / Q000628:therapy; D012516:Osteosarcoma / Q000209:etiology*; D010255:Paranasal Sinus Neoplasms / Q000209:etiology* / Q000473:pathology / Q000628:therapy; D011878:Radiotherapy / Q000009:adverse effects; D013101:Sphenoid Sinus