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The gross and microscopic lesions in the bird of this report were typical of proventricular dilatation disease (PDD). This disease was first identified in macaws in the 1970s and is now known to affect psittacine birds worldwide. 1–4 Clinical signs

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in Journal of the American Veterinary Medical Association

in birds with oviductal prolapse. 2 Mycobacterium genavense , a type of slow growing mycobacterium derived from soil, is the most common isolated agent among mycobacterioses in passerines and psittacines kept in captivity. 4 Most birds infected

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in Journal of the American Veterinary Medical Association

carcinoma, and psittacines, in particular the greycheeked parakeet ( Brotogeris pyrrhoptera ), are most frequently affected. 4,9 In a study 7 of 2,281 domestic fowl necropsied over a 10-year period, 2 cases of proventricular adenocarcinoma were diagnosed

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in Journal of the American Veterinary Medical Association

tumor size with precedent radiation therapy, this may as well be beneficial in avian patients. 5 The case described in the present report has contributed to the scarce reports of thymoma in psittacine birds. Although rare in older psittacine patients

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in Journal of the American Veterinary Medical Association

. 2 Infestations with Knemidocoptes mutans or Knemidocoptes gallinae develop in poultry, whereas Knemidocoptes pilae affects psittacines. 13 Knemidocoptes jamaicensis infestation develops in wild passerines but not in gallinaceous or

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in Journal of the American Veterinary Medical Association

performed, nor was it performed in any of the published cases of chondrosarcomas in wild birds or psittacines. Nonneo-plastic differentials considered for these lesions included severe bacterial pododermatitis, such as can be caused by Staphylococcus aureus

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in Journal of the American Veterinary Medical Association

caused by Psittacid herpesvirus 1 and presents as peracute-to-acute mortality in psittacines. 1 Marek’s disease is caused by Gallid alphaherpesvirus 2 , while other avirulent Marek’s disease viruses include Gallid alphaherpesvirus 3 and Meleagrid

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in Journal of the American Veterinary Medical Association

. 10.2460/javma.244.6.667 12. Leach MW , Paul-Murphy J , Lowenstine LJ . Three cases of gastric neoplasia in psittacines . Avian Dis 1989 ; 33 : 204 – 210 . 10.2307/1591091 13. Forbes NA . Avian gastrointestinal surgery . J Exot

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in Journal of the American Veterinary Medical Association

the predominant organ affected by melanoma in birds 9 ; however, multiple organ systems can be involved. Melanomas often develop as masses that may be detected on physical examination. 1,3,4,6,7,10,11 In psittacines, melanomas have been found in the

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in Journal of the American Veterinary Medical Association

birds, especially psittacines, have been affected. 5 Very few neoplastic processes in owls (particularly screech owls) have been documented. For great horned owls ( Bubo virginianus ), there have been reports of a cutaneous mast cell tumor, 15 a

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in Journal of the American Veterinary Medical Association