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Markedly dilated and thin-walled proventriculus (PV) in a cockatiel (N hollandicus) with experimentally induced PDD. On the right is the PV of the same bird after being removed from the carcass and cut open. Severe impaction with millet seeds is present (arrow). Undigested seeds can also be seen through the wall of the intestine. L, liver; V, ventriculus.
