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Histologic sections of crop tissue were evaluated for the presence of lymphoplasmacytic infiltrates within mesenteric ganglia. All birds with proventricular dilatation syndrome that had lymphoplasmacytic infiltrates in crop ganglia had similar infiltrates in the proventricular and/or ventricular ganglia. False-negative crop biopsy results occurred approximately 24% of the time. More invasive procedures, such as proventricular or ventricular biopsy, may be necessary if the crop biopsy is nondiagnostic in a bird with clinical signs of proventricular dilatation syndrome.

Histologic Evaluation of the Crop for Diagnosis of Proventricular Dilatation Syndrome in Psittacine Birds