G03.2 Benign recurrent meningitis [Mollaret]

Name of the Condition

• Benign recurrent meningitis [Mollaret] (ICD-10 Code: G03.2)

Summary

Benign recurrent meningitis, also known as Mollaret meningitis, is a rare condition characterized by recurrent episodes of inflammation of the meninges (the protective membranes covering the brain and spinal cord). The term "benign" refers to the typically self-limiting nature of the episodes, though symptoms can be severe during attacks. The condition is distinguished by its recurrent pattern and association with specific inflammatory changes in cerebrospinal fluid.

Causes

The exact cause of benign recurrent meningitis is not always clear, but it is often linked to reactivation of herpes simplex virus type 2 (HSV-2) in the nervous system. Other potential triggers include other viral infections, autoimmune processes, or unidentified inflammatory mechanisms. The recurrent nature suggests a persistent or reactivatable underlying factor.

Risk Factors

• Risk factors may include a history of HSV-2 infection, female gender (more commonly reported), and possibly genetic predispositions. Immune system status and prior viral exposure may also play a role, though specific risk factors are not fully defined.

Symptoms

• Symptoms during episodes include severe headache, fever, stiff neck, sensitivity to light, and sometimes altered mental status or seizures. Episodes typically resolve spontaneously within days to weeks but may recur over months or years. Between episodes, patients usually return to baseline health.

Diagnosis

Diagnosis involves clinical evaluation of recurrent meningitis episodes, exclusion of other causes (e.g., bacterial, fungal), and analysis of cerebrospinal fluid (CSF) during an attack. CSF may show characteristic "Mollaret cells" (large, abnormal cells), though these are not always present. PCR testing for HSV-2 in CSF can support the diagnosis.

Treatment Options

Treatment focuses on managing acute episodes, often with antiviral medications (e.g., acyclovir) if HSV-2 is suspected. Symptomatic relief (e.g., pain management, anti-inflammatory drugs) may be used. Long-term prophylaxis is sometimes considered for frequent recurrences, though evidence is limited.

Prognosis and Follow-Up

Prognosis is generally favorable, as episodes are self-limiting and do not typically cause permanent neurological damage. However, recurrent episodes can impact quality of life. Follow-up involves monitoring for symptom recurrence and addressing any underlying triggers or comorbidities.

Complications

While generally benign, complications can include persistent headaches, neurological symptoms from repeated episodes, or rare cases of permanent deficits. Psychological distress from unpredictable episodes may also occur.

Lifestyle & Prevention

• Maintaining overall health and immune function may help reduce recurrence risk. Avoiding known triggers (if identified) and prompt treatment of acute episodes can mitigate symptoms. Stress management and regular medical follow-up are recommended.

When to Seek Professional Help

Seek immediate care for severe headache, fever, stiff neck, or neurological symptoms, as these may indicate meningitis. Recurrent episodes warrant evaluation to rule out other causes and guide management.

Tips for Medical Coders

• Use G03.2 for documented cases of benign recurrent meningitis (Mollaret). Ensure clinical documentation supports the recurrent nature and exclusion of other meningitis causes. Note that "benign" refers to episode self-limitation, not absence of symptoms. Verify specificity of diagnosis in records to avoid misclassification.