title: Osteonecrosis of hyoid bone and thyroid cartilage.
abstract: A 55-year-old man with carcinoma of the right pyriform fossa was treated with cobalt therapy. Subsequently, osteonecrosis of the right greater horn and the right superior horn of the thyroid cartilage developed, followed by pathologic fractures of the processes and spontaneous expulsion of the sequestrae.
mesh_terms: D002294:Carcinoma, Squamous Cell / Q000532:radiotherapy; D003037:Cobalt Radioisotopes / Q000009:adverse effects* / Q000627:therapeutic use; D005598:Fractures, Spontaneous / Q000209:etiology; D006801:Humans; D006928:Hyoid Bone / Q000000981:diagnostic imaging; D007817:Laryngeal Cartilages / Q000000981:diagnostic imaging; D008297:Male; D008875:Middle Aged; D010025:Osteoradionecrosis / Q000150:complications / Q000000981:diagnostic imaging / Q000209:etiology*; D010610:Pharyngeal Neoplasms / Q000532:radiotherapy; D011832:Radiation Injuries / Q000209:etiology*; D011859:Radiography; D011867:Radioisotope Teletherapy / Q000009:adverse effects*; D013957:Thyroid Cartilage / Q000000981:diagnostic imaging
chemical_list: D003037:Cobalt Radioisotopes