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Young cat with large mammary glands...what is it called?

Definition time!

Feline mammary fibroepithelial hyperplasia.

In this condition, young estrous-cycling or pregnant cats (or any cat exposed to progesterone) develop rapid enlargement of the mammary glands. This can look WILD where the cat all of a sudden has huge, sometimes even ulcerated mammary glands. 

Cytologically, there is a combination of benign/hyperplastic epithelial cells and mesenchymal cells, like we see in this photo. Neat huh?!

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