title: Carcinosarcoma of the parotid gland: ultrasound and computed tomography findings.
abstract: Carcinosarcoma is a rare tumour of the salivary gland. The ultrasound and CT appearances of a rapidly enlarging carcinosarcoma in the parotid are described. Both modalities revealed a 4-cm tumour with relatively benign features and no evidence of lymphadenopathy. Ultrasound showed a well-defined mass of homogeneous low echogenicity and posterior acoustic enhancement. Computed tomography showed a parotid mass of homogeneous attenuation similar to muscle, and homogeneous enhancement following contrast. The clue to the malignant nature of the lesion was a short indistinct superficial margin with tumour extension into the adjacent subcutaneous tissues.
authors.affiliation: Department of Diagnostic Radiology and Organ Imaging, Faculty of Medicine, Chinese University of Hong Kong, Prince of Wales Hospital, Shatin, New Territories, Hong Kong. b834756@mailserv.cuhk.hk
authors.forename: A D
authors.initials: AD
authors.lastname: King
authors.forename: A T
authors.initials: AT
authors.lastname: Ahuja
authors.forename: E W
authors.initials: EW
authors.lastname: To
authors.forename: E C
authors.initials: EC
authors.lastname: Chan
authors.forename: P W
authors.initials: PW
authors.lastname: Allen
mesh_terms: D000328:Adult; D002296:Carcinosarcoma / Q000175:diagnosis* / Q000000981:diagnostic imaging; D006801:Humans; D008297:Male; D010307:Parotid Neoplasms / Q000175:diagnosis* / Q000000981:diagnostic imaging; D014057:Tomography, X-Ray Computed; D014463:Ultrasonography