title: Evaluation of dogs and cats with tumors of the ear canal: 145 cases (1978-1992).
abstract: OBJECTIVE
  To characterize the frequency, clinical signs, biologic behavior, and response to treatment of tumors of the ear canal in dogs and cats.
  
  
  METHODS
  Retrospective analysis of medical records.
  
  
  METHODS
  Medical records of 81 dogs (48 malignant tumors, 33 benign tumors) and 64 cats (56 malignant tumors, 8 benign tumors).
  
  
  METHODS
  Data were analyzed for cats and dogs with malignant tumors, and risk factors were analyzed for their potential impact on survival time.
  
  
  RESULTS
  Malignant tumor types most commonly reported included ceruminous gland adenocarcinoma, squamous cell carcinoma, and carcinoma of undetermined origin. Median survival time of dogs with malignant aural tumors was > 58 months, whereas that of cats was 11.7 months. A poor prognosis was indicated by extensive tumor involvement (dogs) and by neurologic signs at time of diagnosis, diagnosis of squamous cell carcinoma or carcinoma of undetermined origin, and invasion into lymphatics or blood vessels (cats).
  
  
  CONCLUSIONS
  Malignant tumors of the ear canal in dogs and cats have a propensity for local invasion, but tend not to metastasize. Squamous cell carcinoma and carcinoma of undetermined origin were the most locally aggressive tumors. Malignant tumors of the ear canal are best managed by aggressive surgical excision. Radiotherapy may be useful when tumors cannot be completely removed.
authors.affiliation: Department of Medical Sciences School of Veterinary, Medicine, University of Wisconsin, Madison 53706, USA.
authors.forename: C A
authors.initials: CA
authors.lastname: London
authors.forename: R R
authors.initials: RR
authors.lastname: Dubilzeig
authors.forename: D M
authors.initials: DM
authors.lastname: Vail
authors.forename: G K
authors.initials: GK
authors.lastname: Ogilvie
authors.forename: K A
authors.initials: KA
authors.lastname: Hahn
authors.forename: W G
authors.initials: WG
authors.lastname: Brewer
authors.forename: A S
authors.initials: AS
authors.lastname: Hammer
authors.forename: D A
authors.initials: DA
authors.lastname: O'Keefe
authors.forename: R
authors.initials: R
authors.lastname: Chun
authors.forename: M C
authors.initials: MC
authors.lastname: McEntee
authors.forename: D L
authors.initials: DL
authors.lastname: McCaw
authors.forename: L E
authors.initials: LE
authors.lastname: Fox
authors.forename: A M
authors.initials: AM
authors.lastname: Norris
authors.forename: J S
authors.initials: JS
authors.lastname: Klausner
mesh_terms: D000230:Adenocarcinoma / Q000453:epidemiology / Q000628:therapy / Q000662:veterinary; D000818:Animals; D002277:Carcinoma / Q000453:epidemiology / Q000628:therapy / Q000662:veterinary*; D002294:Carcinoma, Squamous Cell / Q000453:epidemiology / Q000628:therapy / Q000662:veterinary; D002371:Cat Diseases / Q000453:epidemiology / Q000401:mortality / Q000628:therapy; D002415:Cats; D004283:Dog Diseases / Q000453:epidemiology / Q000401:mortality / Q000628:therapy; D004285:Dogs; D004424:Ear Canal; D004428:Ear Neoplasms / Q000453:epidemiology / Q000628:therapy / Q000662:veterinary*; D005260:Female; D008297:Male; D009361:Neoplasm Invasiveness; D011379:Prognosis; D012189:Retrospective Studies; D012307:Risk Factors; D016019:Survival Analysis