![]() ![]() (B) After trimming the length of the fenestrated component of the drain tubing to accommodate the length of the hematoma cavity, a single suture is used to secure the tip of the drain through the skin surface. “A” indicates the accession incision for drain placement, lateral aspect of the pinna. Blood escapes into the connective tissue gap between the medial and lateral cartilage layers, resulting in aural hematoma formation.įigure 2: Vacuum Drain System. For example, violent head shaking or the ear striking a hard surface can cause a tear of one or more vessels. Rupture of small perforating vessels is a result of a “stress-riser” effect, at the junction of the vessel and the semi-rigid pinnal cartilage. Small vascular channels perforate the conjoined layers, allowing small vessels originated from the lateral pinnal vasculature to supply the medial cartilage layer and overlying cutaneous surface. The pinna assumes a flattened appearance as growth of the dog and cat continues. ![]() As each bud enlarges and elongates, the lateral and medial layers contact and laminate together with connective tissue. During embryologic development, the pinna begins as a small triangular bud. The lateral sheet of cartilage is thinner than the medial sheet of cartilage comprising the scapha. Veterinary Clinic for Low Income Pet Ownersįigure 1: Aural hematoma in a Vizsla, lateral aspect of the left pinna.Ĭontrary to the anatomy literature, anatomic dissection by the author revealed that the pinna (scapha) is not a solid sheet of cartilage: rather it is comprised of two adherent sheets of cartilage. ![]() Vet Services Report Cruelty Animal Advocacy Adopt ![]()
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