title: Absolute polycythemia in a bald eagle (Haliaeetus leucocephalus).
abstract: An approximately 6-mo-old female bald eagle (Haliaeetus leucocephalus) was presented for an inability to fly and bilateral drooped wings. Pectoral muscle atrophy with a moderate polycythemia was present. Over the course of 3 wk, there were no improvements in flight capacity, although the bird gained substantial weight. Further investigation revealed a prominent cyanosis that was responsive to oxygen therapy, a chronic respiratory acidosis with hypoxia, a cardiac murmur, and a persistent polycythemia. No obvious antemortem etiology for the clinical findings was discovered on computerized tomography, angiography, or echocardiography. The bird was euthanatized as a result of the poor prognosis. Necropsy and histopathology revealed no significant cardiovascular or pulmonary pathology. No myopathy was evident on electron microscopy of formalin-fixed tissues. Based on these diagnostics, a neuromuscular disorder is suspected as the cause for the blood gas abnormalities, with a resulting polycythemia from the hypoxia.
authors: Andreia F
authors: AF
authors: Fernandes
authors: Heather
authors: H
authors: Fenton
authors: Shannon
authors: S
authors: Martinson
authors: Marion
authors: M
authors: Desmarchelier
authors: Shannon T
authors: ST
authors: Ferrell
mesh_terms: D000818:Animals; D001715:Bird Diseases / Q000175:diagnosis* / Q000473:pathology; D020307:Eagles / Q000097:blood*; D005260:Female; D011086:Polycythemia / Q000097:blood / Q000473:pathology / Q000662:veterinary*