Acquired hyposegmentation of granulocytes (pseudo-Pelger-Huët anomaly) in a dog.

Hyposegmentation of granulocyte nuclei was diagnosed in an adult dog after unsuccessful attempt at finding an occult chronic infection. Intermittent signs of prostatitis were temporarily observed, but the immature nature of circulating granulocytes persisted nine months. Electron microscopic examination and neutrophil function studies revealed no abnormalities. Since previous blood smear evaluation had been normal, it is proposed that the granulocyte anomaly was acquired and may have resulted from an idiosyncratic reaction to one of several chemotherapeutic agents administered.