Mammary Tumor in Cats - Symptoms, Diagnosis & Surgical Treatment
Learn about feline mammary tumors, early detection, and surgical treatment options.
What is Feline Mammary Tumor?
Feline mammary tumors are highly malignant. Early detection and complete surgical removal are crucial.
Mammary Tumor
Symptoms
Characteristics of Feline Mammary Tumors
About 85–90% of feline mammary tumors are malignant — much higher than in dogs (~50%). They most commonly occur in intact female cats, with an average onset age of 10–12 years. Adenocarcinoma is the most common malignant type.
Symptoms
- Breast mass: firm or soft lump palpable near nipples or mammary tissue
- Multiple gland involvement: cats have 4 pairs (8 glands); multiple simultaneous tumors are common
- Rapid tumor growth: malignant tumors may grow relatively quickly
- Skin ulceration: tumor may break through the skin or form ulcerative lesions
- Nipple discharge: bloody or clear discharge may occur
- Enlarged lymph nodes: swollen axillary or inguinal nodes suggest metastasis
Diagnosis
Initial assessment uses palpation and fine-needle aspiration (FNA). Pre-surgical 3-view chest X-rays check for lung metastasis; abdominal ultrasound evaluates lymph node and organ involvement. Definitive diagnosis is made by post-surgical histopathology. Tumor size (≤3 cm vs >3 cm) and metastatic status are key prognostic factors.
Treatment
- Simple excision vs radical mastectomy: choice depends on tumor size/location; wider margins reduce recurrence
- Post-surgical chemotherapy: doxorubicin-based protocols extend survival in malignant/high-risk tumors
- Concurrent spaying: performed at the same time to reduce hormonal stimulation of any remaining tissue
- Palliative care: focus on pain management and quality of life when extensive metastasis is present
Prevention
- Spay before first heat (5–6 months): reduces mammary tumor risk by 91% — the most effective prevention
- Spay between first heat and 1 year: 86% risk reduction — still highly effective
- Monthly mammary self-exam: gently palpate mammary tissue to detect lumps early
- Regular vet checkups: females over 10 years should have full exams every 6 months
| Spay Timing | Risk Reduction | Notes |
|---|---|---|
| Spay before 6 months | 91% reduction | Most effective |
| Spay before 1 year | 86% reduction | |
| Spay before 2 years | 11% reduction | Benefit decreases sharply |
| Spay after 2 years | No significant benefit | Surgery becomes main treatment |
Sources & References
- Veterinary Cancer Society - Mammary Tumors
- Cornell Feline Health Center - Mammary Gland Tumors
※ This article is for informational purposes only. Consult a veterinarian for diagnosis and treatment.