Clinical meaning
The Bartholin glands (greater vestibular glands) are bilateral, pea-sized, tubuloalveolar glands located at the 4 and 8 o'clock positions of the vaginal vestibule, deep to the posterior labia majora. Each gland drains through a 2-2.5 cm duct that opens at the posterolateral vaginal introitus between the hymeneal ring and the labia minora. The glands produce mucoid secretions composed of mucin glycoproteins (MUC5B, MUC6) that provide vaginal lubrication during sexual arousal. Secretion is mediated by parasympathetic cholinergic stimulation via the pudendal nerve, triggering intracellular calcium signaling and exocytosis of mucin granules from acinar cells.
Bartholin cyst formation occurs when the narrow duct orifice becomes obstructed, most commonly by inspissated mucus, trauma, or inflammation. Continued mucin secretion from acinar cells against a blocked duct creates progressive cystic dilation filled with sterile mucoid fluid. Cysts are typically painless and range from 1-8 cm. The cyst lining transitions from the normal transitional epithelium of the duct to a flattened cuboidal or squamous epithelium under pressure.
Bartholin abscess develops when a cyst becomes secondarily infected or when primary glandular infection occurs. The microbiology is polymicrobial in most cases: anaerobic organisms (Bacteroides fragilis, Peptostreptococcus, Prevotella) predominate, often mixed with aerobic bacteria (Escherichia coli, Staphylococcus aureus including MRSA, Streptococcus species). Neisseria gonorrhoeae and Chlamydia trachomatis are causative in a minority of cases (less than 10-15%) but should be tested for in sexually active women. The confined glandular space creates an ideal environment for abscess formation - bacterial proliferation triggers neutrophilic infiltration, tissue necrosis, pus formation, and an expanding walled-off collection. The surrounding tissue becomes edematous, erythematous, and exquisitely tender, often causing labial asymmetry and severe pain with sitting and ambulation.