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1 June 2001 Chronic Rhinosinusitis and Rhamphothecal Destruction in a Major Mitchell's Cockatoo (Cacatua leadbeateri) due to Cryptococcus neoformans var gattii
SHANE R. RAIDAL, RAY BUTLER
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Abstract

A 7-year-old male Major Mitchell's cockatoo (Cacatua leadbeateri) was presented with an encrusted beak tumor. Clinical examination demonstrated a bird that was bright and alert and had good pectoral muscle condition. The bird was open-mouth breathing and had a bilateral mucopurulent ocular discharge. A relatively well-demarcated thick crust overlaid the right naris and extended along the right lateral wall of the rhamphotheca. Radiographs of the head demonstrated a diffuse increased radiodensity of the nasal sinuses. A diagnosis of cryptococcosis was made by examining Wright's-stained choanal smears, which demonstrated a mixed overgrowth of gram-negative coccobacilli and occasional aggregates of encapsulated yeast organisms measuring 6–10 μm within 8- to 12-μm nonstaining capsules. The bird was euthanized, and necropsy findings were confined to the nasal and infraorbital sinuses. The sinuses contained a pale, gelatinous substance, which yielded a heavy growth of Cryptococcus neoformans var gattii on culture. Histopathologic examination confirmed a diagnosis of nasal cryptococcosis with severe infiltration of the nasal passages with cryptococci and subsequent destruction of the rhamphotheca.

SHANE R. RAIDAL and RAY BUTLER "Chronic Rhinosinusitis and Rhamphothecal Destruction in a Major Mitchell's Cockatoo (Cacatua leadbeateri) due to Cryptococcus neoformans var gattii," Journal of Avian Medicine and Surgery 15(2), 121-125, (1 June 2001). https://doi.org/10.1647/1082-6742(2001)015[0121:CRARDI]2.0.CO;2
Published: 1 June 2001
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