A Bartholin gland cyst forms when one of the two Bartholin glands — located on either side of the vaginal opening at the 4 and 8 o'clock positions of the vulva — becomes blocked and secreted fluid accumulates within the duct. These glands normally provide lubrication at the vaginal introitus; when the duct becomes obstructed, a painless cyst develops. If the retained secretions become infected, a painful and rapidly enlarging abscess forms.
The Bartholin gland cyst is the most common cystic mass of the vulva, but several other glandular cysts of the lower female genital tract present in a similar location and require distinction. Gartner's duct cysts arise from embryologic remnants along the anterolateral vaginal wall, while Skene gland cysts form near the urethral meatus and are often confused with urethral or anterior vaginal wall pathology. MRI is uniquely valuable for characterizing these lesions — precisely localizing the cyst to its gland of origin and identifying any atypical features that warrant biopsy, particularly in postmenopausal women where vulvar malignancy must be confidently excluded.
Causes
Duct obstruction.
The most common cause is mechanical blockage of the Bartholin duct — the narrow channel that carries gland secretions to the surface of the vestibule. When this duct is obstructed, the gland continues to produce mucoid secretions that have nowhere to drain, progressively accumulating and distending the duct and gland into a palpable cyst. Obstruction can result from prior inflammation with scarring, thickened inspissated secretions, minor trauma, congenital duct narrowing, or prior perineal surgery. The cyst wall is formed by the distended duct epithelium and is lined by squamous or transitional epithelium.
Other contributing factors.
Bacterial superinfection of a pre-existing cyst transforms it into an abscess — a tense, exquisitely painful collection of pus within the gland. The organisms most commonly responsible include skin flora (Staphylococcus aureus, including MRSA), gut flora (E. coli, Bacteroides), and sexually transmitted organisms (Neisseria gonorrhoeae, Chlamydia trachomatis). Polymicrobial infection is common. Bartholin cysts occur most frequently in women between ages 20 and 30 during the peak years of gland activity. They are uncommon after menopause — the Bartholin glands atrophy and become largely inactive — so any new vulvar mass in this region in a postmenopausal woman should be treated with a high index of suspicion for Bartholin gland carcinoma and evaluated with biopsy, regardless of its appearance.
Symptoms
Small, uninfected cysts frequently cause no symptoms and are discovered during routine pelvic examination or self-examination. As the cyst enlarges, a noticeable soft, non-tender lump appears at the posterolateral vaginal opening, producing discomfort with walking, prolonged sitting, and intercourse (dyspareunia). The cyst typically appears at one side of the vaginal introitus rather than centrally, which is an important clinical localization feature.
Bartholin abscess presents in stark contrast — the pain onset is acute and rapidly progressive, with the mass becoming exquisitely tender, warm, erythematous, and fluctuant over 24–72 hours. The surrounding vulvar and labial tissue may swell significantly. Fever and systemic symptoms indicate more extensive infection. An abscess that ruptures spontaneously provides dramatic pain relief as pus is released but may leave a sinus tract that perpetuates recurrence if not properly managed. Women with recurrent abscesses — particularly those with no identified precipitating infection — warrant evaluation for Bartholin gland carcinoma.
Diagnosis
Most Bartholin cysts and abscesses are diagnosed by physical examination — the posterolateral vulvar location, characteristic soft and fluctuant quality (cyst) or exquisitely tender fluctuant mass (abscess), and the clinical history are usually sufficient for confident diagnosis without imaging. Culture of any expressed or aspirated material guides antibiotic selection when infection is present.
An MRI of the pelvis is not required for the typical Bartholin cyst but is invaluable in specific situations: when the mass has atypical features (solid components, irregular wall, deep extension, restricted diffusion on DWI) suggesting a neoplastic process; when the lesion occurs in a postmenopausal woman where Bartholin gland carcinoma must be excluded; when it is recurrent despite appropriate treatment; or when surgical planning requires precise delineation of the mass extent and its relationship to the urethra, rectum, and ischiorectal fossa. MRI's soft tissue resolution clearly depicts the cyst's relationship to surrounding structures — particularly whether there is any involvement of the deep perineal spaces — and identifies features that would change management from simple drainage to formal excision or oncologic referral. On MRI, an uncomplicated Bartholin cyst appears as a well-defined, thin-walled T2-hyperintense structure at the characteristic posterolateral location without internal solid components or surrounding infiltration.
Classification
Bartholin-related masses are classified by their content and any malignant potential.
- Bartholin cyst: Sterile, non-infected, mucoid fluid-filled collection from duct obstruction. Typically soft, non-tender, and slow-growing. Treatment is driven by symptom burden rather than size alone.
- Bartholin abscess: Infected cyst containing pus, producing rapid painful enlargement, erythema, warmth, and sometimes fever. Requires prompt drainage for relief. The most common acute vulvar condition seen in emergency settings.
- Bartholin gland carcinoma: Rare malignancy arising within the gland itself — most commonly adenocarcinoma or squamous cell carcinoma. More frequent in women over 40. Any persistent, solid, or atypical vulvar mass in this location in an older woman requires biopsy. MRI is essential for staging when malignancy is confirmed.
Treatments
Treatment depends on whether the cyst is symptomatic, infected, recurrent, or suspicious for malignancy.
Observation: Small, asymptomatic cysts in younger women require no treatment. Warm sitz baths two to three times daily may encourage spontaneous duct opening and drainage, providing relief without procedural intervention. Most small cysts remain stable or intermittently enlarge and shrink without progressing to abscess.
Incision and drainage with Word catheter.
The standard office treatment for symptomatic cysts and abscesses is incision and drainage — a small incision is made in the cyst wall at the vestibular surface and the contents are expressed. To prevent immediate reclosure and recurrence (which is common with simple incision alone), a Word catheter — a small balloon-tipped rubber catheter — is inserted into the cyst cavity and inflated, held in place for 4–6 weeks while a new epithelialized tract forms around it. This creates a permanent neo-ostium through which future secretions can drain, significantly reducing the recurrence rate compared to simple incision alone.
Marsupialization.
For recurrent cysts or abscesses that have failed Word catheter treatment, marsupialization — a minor surgical procedure performed under local or general anesthesia in which the cyst is opened and its walls are sutured open to the vestibular skin, creating a permanent wide opening — provides more durable relief by preventing re-accumulation. This procedure has a lower recurrence rate than catheter treatment for chronic recurrent cases.
Antibiotics.
Antibiotics are added to drainage when there is surrounding cellulitis beyond the local abscess wall, systemic signs of infection (fever, elevated white count), immunocompromised status, suspicion for sexually transmitted infection (gonorrhea or chlamydia testing should be performed), or MRSA risk factors. Antibiotics alone without drainage are insufficient for a Bartholin abscess and should not substitute for procedural management.
Surgical excision.
Complete removal of the Bartholin gland is reserved for repeatedly recurrent cysts or abscesses that have failed multiple drainage procedures, and for any mass where malignancy is suspected or confirmed. Excision is more technically demanding than marsupializaton given the gland's proximity to the vestibular bulb vasculature and the potential for significant intraoperative bleeding. Biopsy is mandatory for all masses in postmenopausal women and for any lesion with atypical features regardless of age.
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