Abstract
A 13-year-old neutered male English Springer Spaniel was presented to The Ohio State University Veterinary Medical Center for evaluation of severe anemia. Upon blood smear review, approximately 50% of the platelets contained single to multiple variably sized clear vacuoles. Transmission electron microscopy of the platelets revealed hallmark features of autophagy, including membrane-lined vesicles and vacuoles containing membrane whorls and degrading organelles. While autophagy has been demonstrated in a wide range of eukaryotic cells for decades, reports of platelet autophagy are lacking. This case report illustrates atypical platelet vacuolation with electron microscopic features characteristic of autophagy.
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