Two Big Lumps, One Brave Senior Girl
Mammary tumors are commonly encountered in older female dogs and may range from benign growths to locally invasive or malignant disease. In this case, an 11-year-old dog was presented with two markedly enlarged masses involving the caudal mammary glands on both sides.
Fine-needle aspiration cytology was performed as part of the initial assessment. The samples contained adipocytes and poorly cohesive mammary epithelial cells, together with mitotic figures and variation in nuclear size. These findings raised concern for mammary neoplasia and supported the recommendation for surgical removal. However, definitive classification of the tumors and confirmation of malignancy would require histopathologic examination of the excised tissues.
Thoracic radiographs showed no visible evidence of pulmonary metastasis at the time of evaluation. Following preoperative assessment, the patient was placed under inhalation anesthesia. A bilateral regional, or bi-regional, mastectomy was performed to remove both tumors together with the affected mammary gland regions. An elective ovariohysterectomy was also completed during the same anesthetic procedure.
The surgery was completed successfully, and the patient remained stable throughout recovery. At the postoperative revisit, the incisions were intact and healing satisfactorily, with no wound dehiscence, major postoperative complication, or clinically apparent local recurrence at the surgical sites.
This case highlights the importance of evaluating mammary growths while they are still small. As tumors enlarge, they may become more difficult to remove and may carry a greater risk of ulceration, infection, discomfort, and involvement of surrounding tissues.
Pet owners should regularly check the entire mammary chain of female dogs, especially senior and unspayed patients. Any new lump, firm area, unusual swelling, or rapidly enlarging growth should be examined promptly. Do not wait for a mammary lump to become this large before visiting a veterinarian.
Clinical Presentation: Two markedly enlarged tumors involving the bilateral caudal mammary glands
Cytologic Findings: Poorly cohesive mammary epithelial cells with mitotic activity and variation in nuclear size
Staging Assessment: No visible pulmonary metastatic lesions detected on thoracic radiographs
Surgical Intervention: Bilateral regional mastectomy and elective ovariohysterectomy under inhalation anesthesia
Outcome: Successful tumor removal with stable recovery, satisfactory incision healing, and no clinically apparent local recurrence at follow-up
Case handled by Dr. Malvin Jay P. Padilla.
Dr. Malvin Jay P. Padilla
Attending Veterinarian