CHAPTER 37 OTITIS EXTERNA, MEDIA, AND INTERNA 561
Fig. 37.21.Tympanic membrane in a 5-year-old male-castrate wheaten terrier appears intact prior to gentle
cleaning. Note prominent vasculature of the pars flaccida and debris that appears caudal to the tympanum.
Fig. 37.22.Gentle cleaning of the ear seen in Figure 37.21 reduced pressure within the bulla, revealing a
defect in the tympanic membrane (white arrow) that was not apparent until debris was removed from the surface
(yellow arrow).