Figure 13-17.

Absolute Erythrocytosis, Hyperviscosity Syndrome, Erythematous Mucous Membranes, Cat.

Erythema of mucous membranes is one of the signs associated with hyperviscosity syndrome. In this case the oral mucous membranes are deeper red (arrows) than normal because of an abnormally high concentration of erythrocytes and associated sludging of blood. Hyperviscosity syndrome may also occur as the result of increased plasma immunoglobulin concentration.

(Courtesy Dr. C. Patrick Ryan, Veterinary Public Health, Los Angeles Department of Health Services; and Noah's Arkive, College of Veterinary Medicine, The University of Georgia.)