title: Extrathyroid carcinoma showing thymus-like differentiation (CASTLE) tumor--a new case report and review of literature.
abstract: BACKGROUND
  We report a case of extrathyroid carcinoma showing thymus-like differentiation (CASTLE) tumor.
  
  
  METHODS
  A 47-year-old man had a left neck mass that gradually enlarged over approximately 3 months. Sonography and CT scans showed a soft tissue mass located at the left parapharyngeal space with displacement of left carotid artery and submandibular gland.
  
  
  RESULTS
  After total excision, the pathologic diagnosis was CASTLE tumor. The patient then received radiotherapy with a total dosage of 6600 cGy. After 21 months of postoperative follow up, there was no evidence of recurrence.
  
  
  CONCLUSIONS
  Generally, the treatment of choice is surgical excision with or without radiotherapy. Because CASTLE tumors have been reported to be radiosensitive, however, and because local recurrence is common, surgical excision with postoperative radiotherapy is suggested.
authors.affiliation: Department of Otolaryngology, Chang Gung Memorial Hospital, 5F, No. 222, Mai-Chin Rd., Keelung, 204 Taiwan.
authors.forename: Cheng-Ming
authors.initials: CM
authors.lastname: Luo
authors.forename: Chuen
authors.initials: C
authors.lastname: Hsueh
authors.forename: Tsung-Ming
authors.initials: TM
authors.lastname: Chen
mesh_terms: D018956:CD5 Antigens; D002277:Carcinoma / Q000473:pathology*; D003131:Combined Modality Therapy; D006258:Head and Neck Neoplasms / Q000000981:diagnostic imaging / Q000473:pathology* / Q000532:radiotherapy / Q000601:surgery; D006801:Humans; D008297:Male; D008875:Middle Aged; D011859:Radiography; D012983:Soft Tissue Neoplasms / Q000000981:diagnostic imaging / Q000473:pathology* / Q000532:radiotherapy / Q000601:surgery; D013945:Thymoma; D013950:Thymus Gland
chemical_list: D018956:CD5 Antigens