Fig. 10.

Crop biopsy from a yellow-crested cockatoo (Cacatua sulphurea) with PDD. A ganglion with severe lymphoplasmacytic infiltration (inset) is present on the adventitial surface of the crop (hematoxylin and eosin staining). The biopsy of this bird included 36 sections of nerves and ganglia, of which 22 were diagnostic for PDD. All 6 slices prepared from this biopsy had at least one diagnostic lesion. However, this is not always the case with crop biopsies (original magnification for inset image ×100 and ×40 for actual image).