Equine Aural Plaque
general considerations
common throughout USA
rare in horses <1y
no breed or sex predilection
etiology and pathogenesis
papilloma virus
back flies may be mechanical vector
history
doesn't bother horses
horse doesn't allow head or ears touch
difficulty putting the bridle or halter on
CS
one to severeal grey or white sharply demarcated plaques
inner surface of pinna(e)
severe cases >50% of inner pinnae affected
usually asymptomatic
may cause discomfort
persist indefinitely
diagnosis
well it's a pretty pathoneumonic presentation so...
biopsy if you really want
search for ear ticks, foreign bodies, mange
treatment
benign neglect
topicals
5% imiquimod
5% acyclovir anecdotally
fly control