Evaluation of dogs and cats with tumors of the ear canal: 145 cases (1978-1992)

Cheryl A. London From the Department of Medical Sciences, School of Veterinary Medicine, University of Wisconsin, Madison, WI 53706 (London, Dubilzeig, Vail); College of Veterinary Medicine and Biomedical Sciences, Colorado State University, Fort Collins, CO 80523 (Ogilvie); Department of Urban Practice, College of Veterinary Medicine, University of Tennessee, Knoxville, TN 37901 (Hahn); Department of Small Animal Medicine and Surgery, College of Veterinary Medicine, Auburn University, AL 36849 (Brewer); Department of Clinical Sciences, College of Veterinary Medicine, The Ohio State University, Columbus, OH 43210 (Hammer); Department of Veterinary Clinical Medicine, College of Veterinary Medicine, University of Illinois, Urbana, IL 61801 (O'Keefe); Department of Veterinary Clinical Sciences, School of Veterinary Medicine, Purdue University, West Lafayette, IN 47907 (Chun); School of Veterinary Medicine, North Carolina State University, Raleigh, NC 27606 (McEntee); Department of Small Animal Medicine and Surgery, College of Veterinary Medicine, University of Missouri, Columbia, MO 65211 (McCaw); Department of Small Animal Clinical Sciences, College of Veterinary Medicine, University of Florida, Gainesville, FL 32610 (Fox); Veterinary Referral Clinic of Mississauga, Mississauga, Ontario, Canada L4Z 1X8 (Norris); and the Department of Small Animal Clinical Sciences, College of Veterinary Medicine, University of Minnesota, St Paul, MN 55108 (Klausner).

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Richard R. Dubilzeig From the Department of Medical Sciences, School of Veterinary Medicine, University of Wisconsin, Madison, WI 53706 (London, Dubilzeig, Vail); College of Veterinary Medicine and Biomedical Sciences, Colorado State University, Fort Collins, CO 80523 (Ogilvie); Department of Urban Practice, College of Veterinary Medicine, University of Tennessee, Knoxville, TN 37901 (Hahn); Department of Small Animal Medicine and Surgery, College of Veterinary Medicine, Auburn University, AL 36849 (Brewer); Department of Clinical Sciences, College of Veterinary Medicine, The Ohio State University, Columbus, OH 43210 (Hammer); Department of Veterinary Clinical Medicine, College of Veterinary Medicine, University of Illinois, Urbana, IL 61801 (O'Keefe); Department of Veterinary Clinical Sciences, School of Veterinary Medicine, Purdue University, West Lafayette, IN 47907 (Chun); School of Veterinary Medicine, North Carolina State University, Raleigh, NC 27606 (McEntee); Department of Small Animal Medicine and Surgery, College of Veterinary Medicine, University of Missouri, Columbia, MO 65211 (McCaw); Department of Small Animal Clinical Sciences, College of Veterinary Medicine, University of Florida, Gainesville, FL 32610 (Fox); Veterinary Referral Clinic of Mississauga, Mississauga, Ontario, Canada L4Z 1X8 (Norris); and the Department of Small Animal Clinical Sciences, College of Veterinary Medicine, University of Minnesota, St Paul, MN 55108 (Klausner).

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David M. Vail From the Department of Medical Sciences, School of Veterinary Medicine, University of Wisconsin, Madison, WI 53706 (London, Dubilzeig, Vail); College of Veterinary Medicine and Biomedical Sciences, Colorado State University, Fort Collins, CO 80523 (Ogilvie); Department of Urban Practice, College of Veterinary Medicine, University of Tennessee, Knoxville, TN 37901 (Hahn); Department of Small Animal Medicine and Surgery, College of Veterinary Medicine, Auburn University, AL 36849 (Brewer); Department of Clinical Sciences, College of Veterinary Medicine, The Ohio State University, Columbus, OH 43210 (Hammer); Department of Veterinary Clinical Medicine, College of Veterinary Medicine, University of Illinois, Urbana, IL 61801 (O'Keefe); Department of Veterinary Clinical Sciences, School of Veterinary Medicine, Purdue University, West Lafayette, IN 47907 (Chun); School of Veterinary Medicine, North Carolina State University, Raleigh, NC 27606 (McEntee); Department of Small Animal Medicine and Surgery, College of Veterinary Medicine, University of Missouri, Columbia, MO 65211 (McCaw); Department of Small Animal Clinical Sciences, College of Veterinary Medicine, University of Florida, Gainesville, FL 32610 (Fox); Veterinary Referral Clinic of Mississauga, Mississauga, Ontario, Canada L4Z 1X8 (Norris); and the Department of Small Animal Clinical Sciences, College of Veterinary Medicine, University of Minnesota, St Paul, MN 55108 (Klausner).

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Gregory K. Ogilvie From the Department of Medical Sciences, School of Veterinary Medicine, University of Wisconsin, Madison, WI 53706 (London, Dubilzeig, Vail); College of Veterinary Medicine and Biomedical Sciences, Colorado State University, Fort Collins, CO 80523 (Ogilvie); Department of Urban Practice, College of Veterinary Medicine, University of Tennessee, Knoxville, TN 37901 (Hahn); Department of Small Animal Medicine and Surgery, College of Veterinary Medicine, Auburn University, AL 36849 (Brewer); Department of Clinical Sciences, College of Veterinary Medicine, The Ohio State University, Columbus, OH 43210 (Hammer); Department of Veterinary Clinical Medicine, College of Veterinary Medicine, University of Illinois, Urbana, IL 61801 (O'Keefe); Department of Veterinary Clinical Sciences, School of Veterinary Medicine, Purdue University, West Lafayette, IN 47907 (Chun); School of Veterinary Medicine, North Carolina State University, Raleigh, NC 27606 (McEntee); Department of Small Animal Medicine and Surgery, College of Veterinary Medicine, University of Missouri, Columbia, MO 65211 (McCaw); Department of Small Animal Clinical Sciences, College of Veterinary Medicine, University of Florida, Gainesville, FL 32610 (Fox); Veterinary Referral Clinic of Mississauga, Mississauga, Ontario, Canada L4Z 1X8 (Norris); and the Department of Small Animal Clinical Sciences, College of Veterinary Medicine, University of Minnesota, St Paul, MN 55108 (Klausner).

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Kevin A. Hahn From the Department of Medical Sciences, School of Veterinary Medicine, University of Wisconsin, Madison, WI 53706 (London, Dubilzeig, Vail); College of Veterinary Medicine and Biomedical Sciences, Colorado State University, Fort Collins, CO 80523 (Ogilvie); Department of Urban Practice, College of Veterinary Medicine, University of Tennessee, Knoxville, TN 37901 (Hahn); Department of Small Animal Medicine and Surgery, College of Veterinary Medicine, Auburn University, AL 36849 (Brewer); Department of Clinical Sciences, College of Veterinary Medicine, The Ohio State University, Columbus, OH 43210 (Hammer); Department of Veterinary Clinical Medicine, College of Veterinary Medicine, University of Illinois, Urbana, IL 61801 (O'Keefe); Department of Veterinary Clinical Sciences, School of Veterinary Medicine, Purdue University, West Lafayette, IN 47907 (Chun); School of Veterinary Medicine, North Carolina State University, Raleigh, NC 27606 (McEntee); Department of Small Animal Medicine and Surgery, College of Veterinary Medicine, University of Missouri, Columbia, MO 65211 (McCaw); Department of Small Animal Clinical Sciences, College of Veterinary Medicine, University of Florida, Gainesville, FL 32610 (Fox); Veterinary Referral Clinic of Mississauga, Mississauga, Ontario, Canada L4Z 1X8 (Norris); and the Department of Small Animal Clinical Sciences, College of Veterinary Medicine, University of Minnesota, St Paul, MN 55108 (Klausner).

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William G. Brewer From the Department of Medical Sciences, School of Veterinary Medicine, University of Wisconsin, Madison, WI 53706 (London, Dubilzeig, Vail); College of Veterinary Medicine and Biomedical Sciences, Colorado State University, Fort Collins, CO 80523 (Ogilvie); Department of Urban Practice, College of Veterinary Medicine, University of Tennessee, Knoxville, TN 37901 (Hahn); Department of Small Animal Medicine and Surgery, College of Veterinary Medicine, Auburn University, AL 36849 (Brewer); Department of Clinical Sciences, College of Veterinary Medicine, The Ohio State University, Columbus, OH 43210 (Hammer); Department of Veterinary Clinical Medicine, College of Veterinary Medicine, University of Illinois, Urbana, IL 61801 (O'Keefe); Department of Veterinary Clinical Sciences, School of Veterinary Medicine, Purdue University, West Lafayette, IN 47907 (Chun); School of Veterinary Medicine, North Carolina State University, Raleigh, NC 27606 (McEntee); Department of Small Animal Medicine and Surgery, College of Veterinary Medicine, University of Missouri, Columbia, MO 65211 (McCaw); Department of Small Animal Clinical Sciences, College of Veterinary Medicine, University of Florida, Gainesville, FL 32610 (Fox); Veterinary Referral Clinic of Mississauga, Mississauga, Ontario, Canada L4Z 1X8 (Norris); and the Department of Small Animal Clinical Sciences, College of Veterinary Medicine, University of Minnesota, St Paul, MN 55108 (Klausner).

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Alan S. Hammer From the Department of Medical Sciences, School of Veterinary Medicine, University of Wisconsin, Madison, WI 53706 (London, Dubilzeig, Vail); College of Veterinary Medicine and Biomedical Sciences, Colorado State University, Fort Collins, CO 80523 (Ogilvie); Department of Urban Practice, College of Veterinary Medicine, University of Tennessee, Knoxville, TN 37901 (Hahn); Department of Small Animal Medicine and Surgery, College of Veterinary Medicine, Auburn University, AL 36849 (Brewer); Department of Clinical Sciences, College of Veterinary Medicine, The Ohio State University, Columbus, OH 43210 (Hammer); Department of Veterinary Clinical Medicine, College of Veterinary Medicine, University of Illinois, Urbana, IL 61801 (O'Keefe); Department of Veterinary Clinical Sciences, School of Veterinary Medicine, Purdue University, West Lafayette, IN 47907 (Chun); School of Veterinary Medicine, North Carolina State University, Raleigh, NC 27606 (McEntee); Department of Small Animal Medicine and Surgery, College of Veterinary Medicine, University of Missouri, Columbia, MO 65211 (McCaw); Department of Small Animal Clinical Sciences, College of Veterinary Medicine, University of Florida, Gainesville, FL 32610 (Fox); Veterinary Referral Clinic of Mississauga, Mississauga, Ontario, Canada L4Z 1X8 (Norris); and the Department of Small Animal Clinical Sciences, College of Veterinary Medicine, University of Minnesota, St Paul, MN 55108 (Klausner).

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Deborah A. O'Keefe From the Department of Medical Sciences, School of Veterinary Medicine, University of Wisconsin, Madison, WI 53706 (London, Dubilzeig, Vail); College of Veterinary Medicine and Biomedical Sciences, Colorado State University, Fort Collins, CO 80523 (Ogilvie); Department of Urban Practice, College of Veterinary Medicine, University of Tennessee, Knoxville, TN 37901 (Hahn); Department of Small Animal Medicine and Surgery, College of Veterinary Medicine, Auburn University, AL 36849 (Brewer); Department of Clinical Sciences, College of Veterinary Medicine, The Ohio State University, Columbus, OH 43210 (Hammer); Department of Veterinary Clinical Medicine, College of Veterinary Medicine, University of Illinois, Urbana, IL 61801 (O'Keefe); Department of Veterinary Clinical Sciences, School of Veterinary Medicine, Purdue University, West Lafayette, IN 47907 (Chun); School of Veterinary Medicine, North Carolina State University, Raleigh, NC 27606 (McEntee); Department of Small Animal Medicine and Surgery, College of Veterinary Medicine, University of Missouri, Columbia, MO 65211 (McCaw); Department of Small Animal Clinical Sciences, College of Veterinary Medicine, University of Florida, Gainesville, FL 32610 (Fox); Veterinary Referral Clinic of Mississauga, Mississauga, Ontario, Canada L4Z 1X8 (Norris); and the Department of Small Animal Clinical Sciences, College of Veterinary Medicine, University of Minnesota, St Paul, MN 55108 (Klausner).

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Ruthanne Chun From the Department of Medical Sciences, School of Veterinary Medicine, University of Wisconsin, Madison, WI 53706 (London, Dubilzeig, Vail); College of Veterinary Medicine and Biomedical Sciences, Colorado State University, Fort Collins, CO 80523 (Ogilvie); Department of Urban Practice, College of Veterinary Medicine, University of Tennessee, Knoxville, TN 37901 (Hahn); Department of Small Animal Medicine and Surgery, College of Veterinary Medicine, Auburn University, AL 36849 (Brewer); Department of Clinical Sciences, College of Veterinary Medicine, The Ohio State University, Columbus, OH 43210 (Hammer); Department of Veterinary Clinical Medicine, College of Veterinary Medicine, University of Illinois, Urbana, IL 61801 (O'Keefe); Department of Veterinary Clinical Sciences, School of Veterinary Medicine, Purdue University, West Lafayette, IN 47907 (Chun); School of Veterinary Medicine, North Carolina State University, Raleigh, NC 27606 (McEntee); Department of Small Animal Medicine and Surgery, College of Veterinary Medicine, University of Missouri, Columbia, MO 65211 (McCaw); Department of Small Animal Clinical Sciences, College of Veterinary Medicine, University of Florida, Gainesville, FL 32610 (Fox); Veterinary Referral Clinic of Mississauga, Mississauga, Ontario, Canada L4Z 1X8 (Norris); and the Department of Small Animal Clinical Sciences, College of Veterinary Medicine, University of Minnesota, St Paul, MN 55108 (Klausner).

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Margaret C. McEntee From the Department of Medical Sciences, School of Veterinary Medicine, University of Wisconsin, Madison, WI 53706 (London, Dubilzeig, Vail); College of Veterinary Medicine and Biomedical Sciences, Colorado State University, Fort Collins, CO 80523 (Ogilvie); Department of Urban Practice, College of Veterinary Medicine, University of Tennessee, Knoxville, TN 37901 (Hahn); Department of Small Animal Medicine and Surgery, College of Veterinary Medicine, Auburn University, AL 36849 (Brewer); Department of Clinical Sciences, College of Veterinary Medicine, The Ohio State University, Columbus, OH 43210 (Hammer); Department of Veterinary Clinical Medicine, College of Veterinary Medicine, University of Illinois, Urbana, IL 61801 (O'Keefe); Department of Veterinary Clinical Sciences, School of Veterinary Medicine, Purdue University, West Lafayette, IN 47907 (Chun); School of Veterinary Medicine, North Carolina State University, Raleigh, NC 27606 (McEntee); Department of Small Animal Medicine and Surgery, College of Veterinary Medicine, University of Missouri, Columbia, MO 65211 (McCaw); Department of Small Animal Clinical Sciences, College of Veterinary Medicine, University of Florida, Gainesville, FL 32610 (Fox); Veterinary Referral Clinic of Mississauga, Mississauga, Ontario, Canada L4Z 1X8 (Norris); and the Department of Small Animal Clinical Sciences, College of Veterinary Medicine, University of Minnesota, St Paul, MN 55108 (Klausner).

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Dudley L. McCaw From the Department of Medical Sciences, School of Veterinary Medicine, University of Wisconsin, Madison, WI 53706 (London, Dubilzeig, Vail); College of Veterinary Medicine and Biomedical Sciences, Colorado State University, Fort Collins, CO 80523 (Ogilvie); Department of Urban Practice, College of Veterinary Medicine, University of Tennessee, Knoxville, TN 37901 (Hahn); Department of Small Animal Medicine and Surgery, College of Veterinary Medicine, Auburn University, AL 36849 (Brewer); Department of Clinical Sciences, College of Veterinary Medicine, The Ohio State University, Columbus, OH 43210 (Hammer); Department of Veterinary Clinical Medicine, College of Veterinary Medicine, University of Illinois, Urbana, IL 61801 (O'Keefe); Department of Veterinary Clinical Sciences, School of Veterinary Medicine, Purdue University, West Lafayette, IN 47907 (Chun); School of Veterinary Medicine, North Carolina State University, Raleigh, NC 27606 (McEntee); Department of Small Animal Medicine and Surgery, College of Veterinary Medicine, University of Missouri, Columbia, MO 65211 (McCaw); Department of Small Animal Clinical Sciences, College of Veterinary Medicine, University of Florida, Gainesville, FL 32610 (Fox); Veterinary Referral Clinic of Mississauga, Mississauga, Ontario, Canada L4Z 1X8 (Norris); and the Department of Small Animal Clinical Sciences, College of Veterinary Medicine, University of Minnesota, St Paul, MN 55108 (Klausner).

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Leslie E. Fox From the Department of Medical Sciences, School of Veterinary Medicine, University of Wisconsin, Madison, WI 53706 (London, Dubilzeig, Vail); College of Veterinary Medicine and Biomedical Sciences, Colorado State University, Fort Collins, CO 80523 (Ogilvie); Department of Urban Practice, College of Veterinary Medicine, University of Tennessee, Knoxville, TN 37901 (Hahn); Department of Small Animal Medicine and Surgery, College of Veterinary Medicine, Auburn University, AL 36849 (Brewer); Department of Clinical Sciences, College of Veterinary Medicine, The Ohio State University, Columbus, OH 43210 (Hammer); Department of Veterinary Clinical Medicine, College of Veterinary Medicine, University of Illinois, Urbana, IL 61801 (O'Keefe); Department of Veterinary Clinical Sciences, School of Veterinary Medicine, Purdue University, West Lafayette, IN 47907 (Chun); School of Veterinary Medicine, North Carolina State University, Raleigh, NC 27606 (McEntee); Department of Small Animal Medicine and Surgery, College of Veterinary Medicine, University of Missouri, Columbia, MO 65211 (McCaw); Department of Small Animal Clinical Sciences, College of Veterinary Medicine, University of Florida, Gainesville, FL 32610 (Fox); Veterinary Referral Clinic of Mississauga, Mississauga, Ontario, Canada L4Z 1X8 (Norris); and the Department of Small Animal Clinical Sciences, College of Veterinary Medicine, University of Minnesota, St Paul, MN 55108 (Klausner).

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Alan M. Norris From the Department of Medical Sciences, School of Veterinary Medicine, University of Wisconsin, Madison, WI 53706 (London, Dubilzeig, Vail); College of Veterinary Medicine and Biomedical Sciences, Colorado State University, Fort Collins, CO 80523 (Ogilvie); Department of Urban Practice, College of Veterinary Medicine, University of Tennessee, Knoxville, TN 37901 (Hahn); Department of Small Animal Medicine and Surgery, College of Veterinary Medicine, Auburn University, AL 36849 (Brewer); Department of Clinical Sciences, College of Veterinary Medicine, The Ohio State University, Columbus, OH 43210 (Hammer); Department of Veterinary Clinical Medicine, College of Veterinary Medicine, University of Illinois, Urbana, IL 61801 (O'Keefe); Department of Veterinary Clinical Sciences, School of Veterinary Medicine, Purdue University, West Lafayette, IN 47907 (Chun); School of Veterinary Medicine, North Carolina State University, Raleigh, NC 27606 (McEntee); Department of Small Animal Medicine and Surgery, College of Veterinary Medicine, University of Missouri, Columbia, MO 65211 (McCaw); Department of Small Animal Clinical Sciences, College of Veterinary Medicine, University of Florida, Gainesville, FL 32610 (Fox); Veterinary Referral Clinic of Mississauga, Mississauga, Ontario, Canada L4Z 1X8 (Norris); and the Department of Small Animal Clinical Sciences, College of Veterinary Medicine, University of Minnesota, St Paul, MN 55108 (Klausner).

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Jeffery S. Klausner From the Department of Medical Sciences, School of Veterinary Medicine, University of Wisconsin, Madison, WI 53706 (London, Dubilzeig, Vail); College of Veterinary Medicine and Biomedical Sciences, Colorado State University, Fort Collins, CO 80523 (Ogilvie); Department of Urban Practice, College of Veterinary Medicine, University of Tennessee, Knoxville, TN 37901 (Hahn); Department of Small Animal Medicine and Surgery, College of Veterinary Medicine, Auburn University, AL 36849 (Brewer); Department of Clinical Sciences, College of Veterinary Medicine, The Ohio State University, Columbus, OH 43210 (Hammer); Department of Veterinary Clinical Medicine, College of Veterinary Medicine, University of Illinois, Urbana, IL 61801 (O'Keefe); Department of Veterinary Clinical Sciences, School of Veterinary Medicine, Purdue University, West Lafayette, IN 47907 (Chun); School of Veterinary Medicine, North Carolina State University, Raleigh, NC 27606 (McEntee); Department of Small Animal Medicine and Surgery, College of Veterinary Medicine, University of Missouri, Columbia, MO 65211 (McCaw); Department of Small Animal Clinical Sciences, College of Veterinary Medicine, University of Florida, Gainesville, FL 32610 (Fox); Veterinary Referral Clinic of Mississauga, Mississauga, Ontario, Canada L4Z 1X8 (Norris); and the Department of Small Animal Clinical Sciences, College of Veterinary Medicine, University of Minnesota, St Paul, MN 55108 (Klausner).

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Objective

To characterize the frequency, clinical signs, biologic behavior, and response to treatment of tumors of the ear canal in dogs and cats.

Design

Retrospective analysis of medical records.

Animals

Medical records of 81 dogs (48 malignant tumors, 33 benign tumors) and 64 cats (56 malignant tumors, 8 benign tumors).

Procedure

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).

Clinical Implications

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. (J Am Vet Med Assoc 1996;208:1413-1418)

Objective

To characterize the frequency, clinical signs, biologic behavior, and response to treatment of tumors of the ear canal in dogs and cats.

Design

Retrospective analysis of medical records.

Animals

Medical records of 81 dogs (48 malignant tumors, 33 benign tumors) and 64 cats (56 malignant tumors, 8 benign tumors).

Procedure

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).

Clinical Implications

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. (J Am Vet Med Assoc 1996;208:1413-1418)

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