Lymphogranuloma Venereum – LGV

Pathogenesis and Lymphatic Invasion

Deep Tissue Invasion and Lymphotropism

• Chlamydia trachomatis is an obligate intracellular bacterium. Serovars L1–L3 carry a specific major outer membrane protein (MOMP) that lets them attach via host receptors and rapidly enter through microscopic breaks in the skin or mucosa.
• Once past the epithelium, the organism does not stay in the subepithelial tissue. It actively enters the lymphatic flow, multiplies inside macrophages and mononuclear cells, and travels to the regional inguinal, femoral or pelvic lymph nodes.

Necrotizing Granulomatous Inflammation and Obstructive Fibrosis (Lymphangitis)

• Within the lymph node, bacterial proliferation triggers a cell-mediated immune response, forming stellate microabscesses surrounded by epithelioid cells and multinucleated giant cells.
• These microabscesses gradually coalesce into a large pus-filled mass (bubo). Inflammation around the nodes (periadenitis) mats them together and fuses them to the overlying skin. Lymphatic thrombosis and secondary fibrosis then block lymph drainage, causing persistent chronic swelling of the external genitalia and rectum.

Clinical Features by Stage

Stage I (Primary Stage – Initial Lesion):

• Incubation period: 3–30 days (average 10–14 days) after exposure.
• Lesion: A small papule, vesicle or shallow ulcer, 2–5 mm across, painless and non-itchy, appears at the site of entry (coronal sulcus, penile shaft, vulva or rectal mucosa).
• Key feature: The ulcer heals on its own within a few days without scarring, so more than 80% of patients never notice this stage.

Stage II (Secondary Stage – Inguinal and Anorectal Syndromes):

• Develops 2–6 weeks after the initial lesion and reflects spread within the lymph nodes:
• Inguinal syndrome (most common in men infected through vaginal intercourse):
  • Firm, painful enlargement of the groin nodes on one or both sides.
  • Groove sign of Greenblatt: the inguinal fold (Poupart's ligament) divides the swelling into two distinct masses, the inguinal nodes above and the femoral nodes below. This is a hallmark clinical sign of LGV.
  • The nodes soften and rupture through the skin, leaving multiple persistent sinuses that drain chocolate-colored pus.
• Anorectal syndrome (more common in women and MSM):
  • Hemorrhagic necrotizing proctitis: severe anal pain, tenesmus, rectal discharge of pus mixed with fresh blood, and diarrhea. Proctoscopy shows dirty ulcerated mucosa with granular, hypertrophic changes that are easily confused with Crohn's disease.

Stage III (Tertiary Stage – Late Fibrotic Complications / Esthiomene):

• Appears years later if the infection is not fully treated:
• Anogenital syndrome (anogenital strictures): fibrotic rectal strictures, rectovaginal fistulas and complex perianal fistulas.
• Genital elephantiasis (esthiomene in women / elephantiasis in men): hard, nodular, hypertrophic swelling of the groin, vulva or penis caused by obstruction of the entire pelvic lymphatic system.

Differential Diagnosis of Genital Ulcers and Lymphadenopathy

Diagnostic Workup at Haute-Derma

Real-Time PCR Genotyping (Gold Standard):

• Swabs are taken from the ulcer, rectal discharge or aspirate from the groin nodes.
• A two-step NAAT/PCR is performed: step 1 confirms the presence of Chlamydia trachomatis; step 2 amplifies specific genes that distinguish serovars D–K from serovars L1, L2 and L3.

Serology:

• Microimmunofluorescence (MIF) or complement fixation test (CFT).
• In a suggestive clinical setting, a CFT titer above 1:64 or an MIF titer above 1:256 strongly supports a diagnosis of LGV.

Groin Node Ultrasound and Histopathology:

• Color Doppler ultrasound assesses the extent of microabscess formation, fibrosis and blood flow in the inguinal nodes.
• Tissue biopsy (when squamous cell carcinoma or lymphoma must be ruled out) shows characteristic stellate microabscesses infiltrated by neutrophils, macrophages and plasma cells.

Treatment and Clinical Management at Haute-Derma

Guideline-Based Antibiotic Regimens (CDC / WHO)

Unlike routine urethral Chlamydia infection, which needs only 7 days of treatment, LGV requires a longer course to clear the organism completely from lymph node tissue:

• First-line regimen: doxycycline 100 mg orally twice daily for 21 consecutive days.
• Alternative regimen 1: erythromycin base 500 mg orally four times daily for 21 consecutive days.
• Alternative regimen 2 (for patients unlikely to adhere to daily dosing): azithromycin 1 g orally once weekly for 3 consecutive weeks (3 g total).

Structure-Preserving Aspiration of Groin Nodes

• Large-bore needle aspiration: indicated when the inguinal nodes are tense and fluctuant, giving the patient immediate pain relief.
• Incision and drainage is contraindicated: cutting into the nodes severely damages an already compromised lymphatic system, creates non-healing sinuses and worsens genital elephantiasis.

Partner Management and Aesthetic Restoration at Haute-Derma

• Partner screening: anyone who had sexual contact (vaginal, anal or oral) with the patient in the 60 days before symptoms began should be examined and given presumptive treatment with doxycycline 100 mg orally twice daily for 7 days (or a single 1 g dose of azithromycin).
• Late tissue restoration at Haute-Derma: once the infection has cleared, mild fibrotic adhesions or genital lymphedema can be treated with fractional CO2 laser combined with microneedling radiofrequency. This helps release fibrous bands, stimulate regeneration of lymphatic flow, and improve both appearance and genital function.