TL;DR: Feline mammary masses are often malignant and require veterinary evaluation within 24 to 48 hours. Capturing a photo helps your vet assess urgency and monitor for rapid changes in the lump.
What is a mammary mass in cats and what does it look like?
A mammary mass is a growth or lump located within the mammary gland tissue, which runs along both sides of a cat's underside from the chest to the groin. While some lumps may be benign cysts, inflammatory conditions, or infections, a high percentage of mammary tumors in cats are unfortunately malignant. These masses can vary in size, feel firm to the touch, and may be fixed to the skin or the underlying muscle.
Is finding a mammary mass on my cat considered an emergency?
- Finding a mammary mass is classified as a Medium Urgency situation that requires veterinary attention within 24 to 48 hours.
- It is rarely an immediate, life-threatening emergency unless the mass is actively bleeding, ulcerated, or causing severe pain.
- Because feline mammary tumors tend to be aggressive and can spread to the lymph nodes or lungs, prompt professional evaluation is vital.
How does taking a photo of the mass help with my cat's triage?
- Capturing a clear, well-lit photo is a vital step that provides a visual record of the mass's size, color, and exact location.
- A photo helps your veterinary team determine how quickly your cat needs to be seen.
- It serves as a baseline to monitor for any rapid changes, such as increased redness or swelling, while you wait for your appointment.
Clinical Context (Merck Veterinary Manual)
Upon detection of a mammary mass in a cat, a mammary tumor should be suspected. Palpate the regional lymph nodes to assess for spread. Thoracic radiographs, including ventral-dorsal and lateral views, should be taken to check for pulmonary metastases. Fine-needle aspirates may help differentiate between inflammatory and neoplastic lesions but may delay definitive diagnosis. Histopathology is crucial for determining the diagnosis, treatment, and prognosis. Treatment typically involves surgery, with options ranging from lumpectomy to radical mastectomy; however, in cats, radical mastectomy has increased the disease-free interval but not survival time. Adjuvant chemotherapy may be considered to combat micrometastatic disease.
Chapter: Oncology, Surgery
Source: The Merck Veterinary Manual, 11th Edition (Page 1404)