Surgical creation of multiple drainage holes versus local injection of corticosteroids for treatment of aural hematomas in dogs: 51 dogs with 71 aural hematomas (2000–2017)

Abstract

OBJECTIVE To investigate the outcome of surgical creation of multiple drainage holes (MDHs) versus local corticosteroid injection (LCI) for treatment of aural hematomas (AHs) in dogs and identify risk factors for recurrence and development of new AHs. ANIMALS 51 dogs with 71 AHs. PROCEDURES Medical records were reviewed, and information on signalment, clinical findings, and outcome was recorded. Recurrence was defined as development of an AH at the primary site after the first month of treatment. Development of a new AH was defined as an AH occurring at a site different from the treated site. RESULTS The recurrence rate after the first month of treatment was significantly higher following the LCI procedure (17/48 AHs [33%]) than after the MDH procedure (1/24 AHs [4%]). The odds of recurrence increased as the numbers of LCI in the first month increased (OR, 2.414). Recurrent AHs after LCI resolved with additional LCIs; only 1 AH (2%) required a change to MDHs. No recurrence was observed after the eighth month, and the cosmetic results were good. Sixteen of 51 (31%) dogs had multiple or new AHs. The risk of new AHs was higher in Golden Retrievers and Labrador Retrievers and in dogs with allergic dermatitis. CONCLUSIONS AND CLINICAL RELEVANCE Long-term outcomes suggested that both creation of MDHs and LCI can be therapeutic options for dogs with AHs. However, the risk of new AH development should be considered, especially in retriever breeds and dogs with allergic dermatitis.