Question of the Day

Bacterial infection.

There are both intracellular and extracellular bacteria present in this cytology.

The abscess should be drained and the animal placed on appropriate antibiotics.

Mast cell tumors are round cell tumors with basophilic granules that are smaller than bacteria.

Ref: Cote, Clinical Veterinary Advisor-Dogs and Cats, 3^rd ed. pp. 5-6. Image courtesy, Nottingham Vet School.