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What Is Your Diagnosis?

A 15-year-old female white-capped pionus parrot (Pionus senilis) was presented to the Veterinary Medical Teaching Hospital, Kansas State University, (Manhattan, KS, USA) because of a 10-day history of a slightly decreased appetite and a 1-week progression of dyspnea. The bird was housed with a male pionus parrot in a small, 8-bird aviary with good husbandry practices. There was no history of recent illness in any of the birds in the aviary. The bird’s housing was adequate, and all birds were maintained on a pelleted diet supplemented with fresh vegetables and fruits. On physical examination, the bird weighed 223 g and was bright, alert, and in fair body condition. The bird had a moderate inspiratory stridor and open-mouth breathing. A blood sample was collected by venipuncture of the right jugular vein for a complete blood count and plasma biochemical analysis. Although the white blood cell count of 9500 cells/ l was within reference ranges, abnormal hematologic results included the following: lymphocytes, 14% (reference range, 25%–45%); monocytes, 12% (reference range, 0%–2%); 2 polychromasia; and a 1–2 anisocytosis.1 Results of the plasma biochemical analysis revealed a high concentration of aspartate aminotransferase (AST) (1004 IU; reference range, 135–365 IU/L). Whole-body radiographs were obtained (Figs 1 and 2).