Mast Cell Tumor in a Dog 

 

Cytology
original magnification x1000

Author : Dr Pierre Hébert

A 14 year-old mixed-breed male dog presented for a mass on the right stifle. The cytologic examination (1000X original magnification) was highly cellular and consisted of mononuclear cells with a central nucleus and abundant cytoplasm filled with purple granules (Diff-Quick®). This cytoplasmic presentation is typical of a mast cell tumor.

 

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