An umbrella cockatoo (Cacatua alba) of unknown age was examined because of a 6-month history of gradually worsening ataxia and intention tremors. Results of diagnostic tests were unremarkable, and the bird was euthanized after no improvement with empirical therapy. At necropsy, a large, poorly-defined mass was found in the cerebellum. The mass was identified as medulloblastoma, a type of primitive neuroectodermal tumor.
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Vol. 17 • No. 1