NAVLE Integumentary

Canine Aural Hematoma Study Guide

📅 March 28, 2026 ⏱ 25 min read 👁 1 views

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.

Category	Specific Causes
Otitis Externa/Media	Most common cause • Bacterial (Staphylococcus, Pseudomonas), Yeast (Malassezia)
Hypersensitivity	43 percent of canine otitis - Atopy, food allergies
Parasitic	Ear mites (Otodectes), Sarcoptic mange, Flea allergy
Other	Foreign bodies, Coagulopathies (Cushing's), Trauma, Neoplasia

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.

Key Point: Aural hematoma is NOT a primary diagnosis but sequela of pruritus or trauma.

Underlying Causes

High-YieldAlways treat underlying cause. Failure to address primary condition leads to recurrence. Hypersensitivity = 43 percent of canine otitis cases.

Breed	Odds Ratio	Clinical Significance
Bull Terrier	7.42	Highest risk. Bull breed neck/head create forceful trauma.
Saint Bernard	7.28	Large breed, heavy pendulous ears
French Bulldog	6.95	Brachycephalic with allergies/otitis predisposition
Golden Retriever	4.17	Pendulous ears, high atopy prevalence

Anatomy of Canine Pinna

Auricular Cartilage: Thin elastic cartilage with perichondrium. Skin: Concave (hairless) and convex (haired) surfaces. Hematomas form on concave surface. Vascular Supply: Great auricular artery with branches along medial/lateral margins.

NAVLE TipSutures MUST be placed PARALLEL to pinna long axis to avoid vessel ligation and avascular necrosis.

Method	Advantages	Disadvantages	Recurrence
Surgery	Definitive, lowest recurrence, single procedure	Anesthesia required, higher cost, scarring	Low (less than 5 percent)
Aspiration + Steroid	Minimally invasive, good cosmesis, lower cost	Multiple treatments, longer healing	Moderate-High
Oral Steroids	Simplest, no procedures, 87.5 percent improvement	Steroid side effects, prolonged course	Variable

Breed Predisposition and Risk Factors

Ear Carriage: V-shaped drop and semi-erect ears have HIGHEST risk (fold line trauma). Age: middle-aged to older. Weight: heavier dogs create more trauma.

Clinical Presentation and Diagnosis

History: Acute ear swelling, vigorous head shaking, ear scratching, pre-existing ear disease. Physical Exam: Fluctuant fluid-filled swelling on concave pinna surface. Warm, soft (early) to firm (later). Size: grape to orange. May occlude ear canal.

Diagnostic Approach: Clinical diagnosis. ALWAYS perform otoscopy and otic cytology. Fine-needle aspiration yields serosanguineous fluid. Coagulation tests if spontaneous or bleeding history.

Treatment Options

Treatment goals: remove hematoma, prevent recurrence, maintain cosmetic appearance, treat underlying cause.

Surgical Management (Gold Standard)

Technique: Incision (linear or S-shaped) on concave surface. Drain contents, flush. Place mattress sutures 8-10mm apart PARALLEL to long axis. Leave slightly open for drainage. Compression bandage + E-collar. Remove sutures 2-3 weeks.

Advantages: Definitive treatment, lowest recurrence (less than 5 percent), single procedure. Disadvantages: Requires anesthesia, higher cost, some scarring.

Medical Management

Needle Aspiration + Steroid: Most common initial approach (43 percent of vets). Aspirate hematoma, inject triamcinolone 0.5-1 mg/kg (max 20mg). Multiple treatments often needed. Good cosmesis but higher recurrence.

Oral Prednisolone Alone: 1 mg/kg/day × 14d, then 0.5 mg/kg/day × 14d. 87.5 percent improvement rate. Simplest approach but steroid side effects.

Less-Invasive Options

Teat Cannula: Passive drainage. Sedation only. Higher recurrence. Active Drain: Closed-suction drainage. Quantifiable fluid. PRP: Novel treatment with ultrasound guidance. 38.5d resolution.

Treatment Comparison

NAVLE TipSutures PARALLEL to pinna. Incise skin only, NOT cartilage. Address underlying cause or recurrence inevitable.

Complications and Prognosis

Complications: Recurrence (most common), infection/cellulitis, avascular necrosis (from vessel ligation), scarring, cauliflower ear (untreated cases), ear canal stenosis.

Prognosis: Good to excellent when properly treated AND underlying cause addressed. Untreated: eventual resolution over months with permanent cauliflower deformity.

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