Pelger-Huët anomaly in a cat

A 14-year-old, spayed female Domestic Shorthair cat was referred to the Purdue University Veterinary Teaching Hospital (PUVTH) for iodine 131 treatment of hyperthyroidism. Upon arrival, a biochemistry profile and a CBC were performed. Approximately 50% of the neutrophils and all the eosinophils observed were hyposegmented with a mature, condensed chromatin pattern. Nuclei had a band to "dumbbell" shape, and rarely a round shape, suggesting a Pelger-Huët anomaly or a pseudo Pelger-Huët. Based on both a negative FeLV and FIV tests, the absence of any clinical signs to support an inflammatory process, and the persistence of this granulocytic morphology 6 months after its previous admission to the PUVTH, a diagnosis of Pelger-Huët anomaly was established in this cat.