Merck Manual

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Aspergillus spp in guttural pouch mycosis
Aspergillus spp in guttural pouch mycosis

Aspergillus spp, periodic acid-Schiff (PAS) stain, guttural pouch mycosis. Note the characteristic filamentous hyphae present in large numbers in the guttural pouch wall.

Courtesy of Dr. John Prescott.