Canine Apocrine Sweat Gland Tumors: A Skin-Gland Mass Requires Histopathology
Overview
Apocrine gland tumors arise from sweat-gland structures in the skin and include benign and malignant forms. They often present as solitary nodules, but palpation and surface appearance cannot establish the subtype.
Common signs
A firm skin nodule or plaque that may be hairless, cystic, ulcerated, bleeding or discharging. Some remain slow-growing while others infiltrate nearby tissue.
Common locations
Trunk, limbs, head and other haired-skin sites. Specialized gland tumors of the ear canal and anal sac are separate clinical problems.
Diagnosis discussion
Fine-needle aspiration may suggest an epithelial or glandular lesion. Histopathology is needed to name the tumor, assess invasion and report margins. Regional-node sampling and imaging are considered for malignant histology or concerning examination findings.
Urgency and when to contact a veterinarian
Arrange prompt evaluation for a persistent gland-like nodule. Seek earlier care for rapid growth, repeated bleeding, pain, foul discharge, fixation or systemic illness.
Treatment discussion
Complete planned excision is a common local-control strategy. Wider surgery, radiation, systemic therapy or surveillance may be discussed according to subtype, grade, margins and spread.
Home monitoring
Measure and photograph the lesion or scar, note discharge and pain, and feel only as the veterinarian demonstrates. Keep scheduled node and skin rechecks.
Questions to ask your veterinarian
- Is an incisional biopsy needed before choosing surgical margins?
- Which pathology features distinguish benign from malignant behavior?
- Should the draining lymph node be sampled?
- What recurrence or wound signs should trigger an early visit?