What is pelvic congestion syndrome?

What is Pelvic Congestion Syndrome?

Pelvic congestion syndrome (PCS) is a condition characterized by chronic pelvic pain lasting more than 6 months caused by venous insufficiency—specifically reflux or obstruction in pelvic veins (ovarian, internal iliac, or uterine veins)—resulting in engorged periuterine and periovarian varicosities. 1, 2

Clinical Presentation

PCS predominantly affects premenopausal, multiparous women and manifests as:

• Dull, aching pelvic pain that worsens with:

  • Prolonged standing or walking
  • Pre-menstrual period
  • Post-coital period (pathognomonic feature)
  • Fatigue

• Associated symptoms include:

  • Dyspareunia (painful intercourse)
  • Dysmenorrhea
  • Bladder irritability
  • Rectal discomfort
  • Vulvar or lower extremity varicosities 3, 4

The pain is typically relieved by lying down, distinguishing it from other causes of chronic pelvic pain.

Pathophysiology

PCS results from pelvic venous disease involving:

• Venous reflux: Retrograde (caudal) flow in ovarian or internal iliac veins
• Venous obstruction: Compression of left common iliac vein (May-Thurner anatomy) or left renal vein (nutcracker syndrome)
• Combined reflux and obstruction 2

The condition involves estrogen overstimulation, explaining why symptoms may subside after menopause 1. Many patients show morphologic features of polycystic ovarian syndrome on imaging (enlarged ovaries with peripheral follicles) without typical clinical features like hirsutism or amenorrhea 1.

Diagnostic Approach

First-Line Imaging

Transvaginal ultrasound with Doppler is the initial diagnostic tool, looking for:

• Engorged periuterine/periovarian veins ≥8 mm diameter
• Low-velocity flow <3 cm/s
• Retrograde flow in ovarian veins
• Altered flow with Valsalva maneuver
• Myometrial arcuate vein dilatation ≥5 mm 1

Advanced Imaging

• MRI with gadolinium: Problem-solving modality when ultrasound is inconclusive; time-resolved post-contrast T1-weighted imaging directly demonstrates ovarian vein reflux 1
• CT abdomen/pelvis with contrast: Shows engorged pelvic veins and anatomic variants (left renal vein compression), but lacks dynamic flow information 1

Gold Standard

Transcatheter venography with IVUS remains definitive, performed immediately before treatment. IVUS thresholds for intervention:

• >50% area reduction or >61% diameter stenosis at the lesion site
• Dynamic evaluation with breath-hold and Valsalva maneuvers to distinguish fixed pathologic lesions from dynamic compressions 2

Key Diagnostic Pitfalls

• PCS is a diagnosis of exclusion—rule out endometriosis, adhesive disease, inflammatory conditions, and neoplasia first 1
• Laparoscopy has limited sensitivity for PCS due to CO2 pneumoperitoneum compressing veins and Trendelenburg positioning 4
• Clinical overlap with endometriosis is common; up to 30% of chronic pelvic pain cases may be PCS, but it remains underdiagnosed 4, 5
• Post-coital pain exacerbation and pain worsening with standing are pathognomonic features that distinguish PCS from endometriosis 4

Treatment Hierarchy

Primary Treatment

Ovarian vein embolization (OVE) is the treatment of choice:

• 75% achieve substantial pain relief in meta-analysis of 1,308 women
• Technical success rates: 96-100%
• Symptom relief sustained over time with low repeat intervention rates
• Transient colic-like pain common post-procedure (resolves in 5 minutes)
• <2% risk of coil migration 6, 3

Combined Pathology

When both reflux and NIVL (nonthrombotic iliac vein lesion) are present:

• Simultaneous or staged iliac vein stenting + ovarian vein embolization provides superior symptom relief compared to embolization alone 2
• Internal iliac vein embolization (in addition to ovarian vein embolization) is safe and effective for reducing pelvic pain 6

Alternative Approaches

• Foam sclerotherapy: 75% symptomatic improvement; good alternative for leg/vulvar/pudendal varicosities of pelvic origin 6
• Surgical ligation: Laparoscopic ovarian vein ligation showed complete symptom resolution in small series, but has been superseded by less invasive embolization 6
• Medical and conservative management are less effective than endovascular therapy 7

Clinical Context

PCS accounts for up to 30% of chronic pelvic pain cases in women, yet remains underdiagnosed due to lack of standardized protocols and awareness 2, 4. The condition impacts up to 26% of women worldwide at some point during their lives 2.

There is a lack of clear definition and high-quality evidence in this clinical domain—no prospective, multicenter randomized controlled trials exist for investigation or management 1, 3. However, the substantial body of literature demonstrates excellent outcomes following endovascular treatment, with 70-90% achieving long-term symptomatic relief 3.

A multidisciplinary approach involving gynecologists and interventional radiologists is essential for timely diagnosis and effective management 8, 9.