Cloacal papillomas in psittacines.
Papilloma-like masses affecting the cloaca of 19 Amazons, 16 macaws, 3 parrots, 1 conure, and 1 parakeet were examined. Papillomatous lesions were characterized by proliferation of the lining epithelium on thin fibrovascular stalks. Carcinoma in situ was diagnosed in the cloaca of a macaw in addition to the other 16 macaws with papillomas. Papillomavirus group-specific antigens were not detected in any of the 41 lesions, using the peroxidase-antiperoxidase technique. The DNA extracts from 6 different frozen papillomas did not contain papillomavirus genomes detectable by Southern blot hybridization, using an African gray parrot cutaneous papillomavirus as a probe. Evidence of an infective agent was not found by electron microscopic examination of 8 of the papillomas. Inoculations of partially purified homogenates of a cloacal papilloma from a yellow-crowned Amazon did not induce lesion formation on cloacal mucosa of an adult yellow-crowned Amazon, green and yellow macaw, sulphur-crested cockatoo, or mollucan cockatoo.
Sundberg
J P
JP
Junge
R E
RE
O'Banion
M K
MK
Basgall
E J
EJ
Harrison
G
G
Herron
A J
AJ
Shivaprasad
H L
HL
D000818:Animals; D001717:Birds; D002988:Cloaca / Q000473:pathology*; D008854:Microscopy, Electron; D010212:Papilloma / Q000473:pathology / Q000648:ultrastructure / Q000662:veterinary*; D013045:Species Specificity; D013194:Staining and Labeling