Canine Aural Hematoma Study Guide
Overview and Clinical Importance
Aural hematoma (auricular hematoma or otohematoma) is a blood-filled swelling of the pinna (ear flap) between skin and auricular cartilage. This common condition represents a significant portion of integumentary presentations on the NAVLE. Not life-threatening but requires prompt treatment to prevent permanent deformity and patient discomfort.
Estimated one-year incidence: 0.25 percent of canine population. Certain breeds show significantly higher predisposition. Understanding pathophysiology, breed predispositions, diagnosis, and treatment is essential for board success.
Pathophysiology and Etiology
Mechanism
Blood accumulates between auricular cartilage and skin of pinna. Two theories: (1) Trauma Theory - vigorous head shaking creates wave motions causing cartilage fracture and vessel rupture. (2) Immunologic Theory - autoimmune process may contribute to cartilage degeneration.
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