A55 Chlamydial lymphogranuloma (venereum)

Name of the Condition

• Chlamydial lymphogranuloma (venereum)

Summary

Chlamydial lymphogranuloma (venereum) is a sexually transmitted infection caused by specific serovars of Chlamydia trachomatis. The condition progresses through distinct stages, starting with small, painless genital ulcers that may go unnoticed, followed by painful swelling of the lymph nodes in the groin. If left untreated, it can lead to chronic complications such as genital scarring or rectal strictures.

Causes

The infection is caused by Chlamydia trachomatis serovars L1, L2, or L3. Transmission occurs through direct contact with infected genital, oral, or rectal mucosa during sexual activity. The bacteria invade lymphatic tissues, leading to the characteristic lymph node inflammation and tissue damage.

Risk Factors

• Unprotected sexual contact with an infected partner
• Multiple sexual partners
• History of other sexually transmitted infections
• Residence in or travel to regions with high prevalence of the infection
• Anal intercourse, which increases risk of rectal involvement

Symptoms

• Small, painless ulcers or sores at the site of infection (often unnoticed)
• Swollen, tender lymph nodes in the groin (buboes) that may rupture and drain
• Painful bowel movements or rectal discharge (if rectum is involved)
• Genital swelling or edema
• Systemic symptoms like fever, malaise, or headache in some cases

Diagnosis

Diagnosis is based on clinical presentation, sexual history, and laboratory testing. Nucleic acid amplification tests (NAATs) on genital, rectal, or ulcer swabs detect Chlamydia trachomatis DNA. Serologic tests for antibody titers may support diagnosis, especially in later stages. Imaging (e.g., ultrasound) can assess lymph node involvement or complications like fistulas.

Treatment Options

• Antibiotics: Doxycycline is the first-line treatment for 21 days. Alternatives include erythromycin or azithromycin for shorter courses.
• Lymph node drainage: Aspiration or incision of large, painful buboes may be necessary to relieve pressure.
• Partner notification and treatment: Sexual partners should be tested and treated to prevent reinfection.
• Symptom management: Pain relievers and warm compresses can alleviate discomfort from lymph node swelling.

Prognosis and Follow-Up

With prompt antibiotic treatment, most patients recover fully without long-term complications. Follow-up testing 3–6 months post-treatment confirms resolution. Untreated cases may progress to chronic genital or rectal scarring, fistulas, or lymphatic obstruction. Regular sexual health screening is recommended for high-risk individuals.

Complications

• Genital elephantiasis (severe swelling due to lymphatic blockage)
• Rectal strictures or fistulas
• Chronic pelvic pain
• Infertility (rare, associated with severe pelvic inflammation)
• Increased risk of HIV transmission due to genital ulcers

Lifestyle & Prevention

• Consistent use of barrier methods (e.g., condoms) during sexual activity
• Regular sexual health screenings, especially for those with multiple partners
• Prompt treatment of any genital sores or unusual discharge
• Abstinence from sexual activity until treatment is complete and partners are treated
• Education on safe sex practices and recognition of early symptoms

When to Seek Professional Help

Seek medical care if you experience:

• Painful genital swelling or sores
• Unusual discharge from the genitals or rectum
• Fever or systemic symptoms with genital discomfort
• Persistent symptoms after suspected exposure
• Concerns about potential exposure to an infected partner

Tips for Medical Coders

Use code A55 for chlamydial lymphogranuloma (venereum). Document the anatomic site (e.g., genital, rectal) and stage of infection (e.g., primary ulcer, bubo formation) when available, as this may impact coding specificity. Note any complications (e.g., strictures, fistulas) separately if they require additional coding. Ensure sexual history and test results support the diagnosis for accurate code assignment.