Page 84 - BSAVA Manual of Canine and Feline Head, Neck and Thoracic Surgery, 2nd Edition

Chapter 5 · Surgery of the ear
Chapter 5 · Surger y of the ear

➜ OPERATIVE TECHNIQUE 5.1 CONTINUED
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The patient is in lateral recumbency with An instrument is inserted into the ear canal to identify the position of the vertical canal. A
the pinna lying over the head, away from U-shaped incision is made over the lateral surface of the canal.
the surgical site.

ubcutaneous tissues are dissected a ay from the lateral surface of the To ensure the cuts in the vertical ear canal are in the correct site, it is
vertical canal. helpful to score the cartilage ith a scalpel tip. These marks can then
be followed with the scissors (see next image).

The lateral wall of the vertical canal is incised to form the ‘drainage The distal third of the cartilage flap is transected to complete the
board’. ‘drainage board’.

PRACTICAL TIP

The ‘drainage board’ must lie flat and should not obstruct the horizontal canal. Make sure the base of
this flap originates slightly below the midpoint of the horizontal canal circumference. If the flap is
calcified, dissect between the epithelium and cartilage and transect the cartilage to make a hinge.
The final opening should be circular or slightly ovoid

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