Question of the Day

This is feline mammary hyperplasia (a.k.a. hypertrophy, fibroadenomatosis), perform ovariohysterectomy (OVH) to prevent recurrence. It can resolve on its own within a few weeks but is likely to recur without OVH. Medical Tx includes progesterone blockers.

Mammary hyperplasia occurs secondary to high progestogen concentrations (endogenous or exogenous) and can occur in males or females, intact or sterilized.

DDX include mastitis and mammary gland neoplasia. Mastitis typically occurs in lactating queens and presents with systemic signs. Neoplasia is more common in older cats (average 11 y) and mammary swelling is typically not acute.

Tx mastitis with warm compresses and broad-spectrum antimicrobials.

Domperidone and warm compresses are contraindicated as these can stimulate lactation.

Image courtesy of Uwe Gille.