Eosinophilic Meningitis: Symptoms, Causes, Diagnosis and Treatment

Written by Medicover Team and Medically Reviewed by Dr Krishna Haskar Dhanyamraju , Neurologists

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1. Causes 2. Find a Doctor 3. Diagnosis 4. Treatment 5. FAQs

Eosinophilic Meningitis is a rare form of meningitis characterised by an increased number of eosinophils, a type of white blood cell, in the cerebrospinal fluid (CSF). It is most commonly caused by parasitic infections, particularly Angiostrongylus cantonensis (rat lungworm), but may also result from fungal infections, certain medications, malignancies, or autoimmune disorders. Symptoms typically include severe headache, fever, neck stiffness, nausea, vomiting, sensitivity to light, and neurological abnormalities. Early diagnosis and appropriate treatment of the underlying cause are essential to relieve symptoms, prevent neurological complications, and improve outcomes.

What are the Types of Eosinophilic Meningitis?

Eosinophilic meningitis encompasses several types, each with varying etiologies and clinical presentations. The two main types include Angiostrongylus cantonensis and Gnathostoma spinigerum.

Angiostrongylus cantonensis, commonly known as rat lungworm, is transmitted through contaminated food or water, leading to eosinophilic meningitis in humans. On the other hand, Gnathostoma spinigerum is caused by the consumption of raw or undercooked freshwater fish containing the parasite larvae.

Both types result in inflammation of the meninges, with symptoms such as severe headaches, neck stiffness, fever, and neurological deficits. Early diagnosis and treatment are crucial to prevent complications and ensure recovery.

Primary Eosinophilic Meningitis: Caused by parasitic infections such as Angiostrongylus cantonensis.
Secondary Eosinophilic Meningitis: May result from allergic reactions, autoimmune diseases, or certain medications.
Idiopathic Eosinophilic Meningitis: Occurs without a clear identifiable cause.
Chronic Eosinophilic Meningitis: Characterized by persistent inflammation of the meninges.
Acute Eosinophilic Meningitis: Presents with sudden onset symptoms and rapid disease progression.

What Are the Symptoms of Eosinophilic Meningitis?

Eosinophilic meningitis can present with symptoms such as severe headache, neck stiffness, nausea, vomiting, and fever. Patients may also experience visual disturbances, weakness, numbness, and tingling in the limbs. Some individuals might develop skin rashes or muscle pain as well.

If you have these symptoms, especially after exposure to contaminated food or water, it is important to seek medical attention promptly for appropriate diagnosis and treatment. Early detection and management can lead to a better outcome in eosinophilic meningitis.

Severe headache is a common symptom of eosinophilic meningitis, often described as intense and persistent.
Nausea and vomiting may accompany eosinophilic meningitis due to increased pressure within the skull.
Neck stiffness is a classic sign of eosinophilic meningitis, making it difficult to bend the neck forward.
Visual disturbances, such as blurry vision or sensitivity to light, can occur in individuals with eosinophilic meningitis.
Fever is a systemic symptom of eosinophilic meningitis, indicating inflammation and infection in the central nervous system.

What are the Causes of Eosinophilic Meningitis?

This parasite is typically found in snails and slugs, which serve as intermediate hosts. Humans can become infected by consuming raw or undercooked snails, contaminated vegetables, or water. Other less common causes of eosinophilic meningitis include other parasitic infections such as Gnathostoma spinigerum and Baylisascaris procyonis. In some cases, non-infectious factors like allergic reactions or autoimmune conditions can also trigger eosinophilic meningitis.

Infections such as angiostrongyliasis can lead to eosinophilic meningitis by triggering an immune response in the brain.
Parasitic infections like gnathostomiasis can cause eosinophilic meningitis as the parasites invade the central nervous system.
Consuming contaminated food containing Angiostrongylus cantonensis larvae can result in eosinophilic meningitis, a rare but serious condition.
Autoimmune conditions like eosinophilic granulomatosis with polyangiitis (EGPA) can lead to eosinophilic meningitis due to immune system dysfunction.
Certain medications, including some nonsteroidal anti-inflammatory drugs (NSAIDs), have been associated with rare cases of eosinophilic meningitis.

When to See a Doctor for Eosinophilic Meningitis?

Anyone with severe headache, fever, neck stiffness, or neurological symptoms especially after travel to endemic areas or consumption of high-risk foods should seek prompt evaluation by a Neurologist or Infectious Disease Specialist.

You should see a doctor if you experience:

Persistent severe headache with fever
Neck stiffness or sensitivity to light
Numbness, tingling, or unusual neurological symptoms

Seek emergency medical attention immediately if you:

Develop seizures or loss of consciousness
Experience confusion, severe weakness, or difficulty speaking
Have rapidly worsening headache with persistent vomiting or signs of increased pressure inside the skull

These symptoms may indicate serious neurological complications requiring urgent medical treatment.

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How Is Eosinophilic Meningitis Diagnosed?

Additionally, serological tests may be conducted to detect specific parasitic infections that can cause eosinophilic meningitis. The diagnostic process is guided by the patient's symptoms, travel history to endemic regions, and laboratory findings to establish a definitive diagnosis and determine the appropriate treatment approach.

Eosinophilic meningitis diagnosis involves analyzing cerebrospinal fluid for elevated eosinophils.
Imaging studies like MRI or CT scans may reveal abnormalities in the brain or spinal cord.
Blood tests can help identify underlying infections or conditions associated with eosinophilic meningitis.
Lumbar puncture is crucial for obtaining cerebrospinal fluid for analysis and confirming the diagnosis.
Polymerase chain reaction (PCR) tests can detect specific parasites like Angiostrongylus cantonensis in the cerebrospinal fluid.

What are the Treatment for Eosinophilic Meningitis?

Eosinophilic meningitis, often caused by parasitic infections like Angiostrongylus cantonensis, typically requires prompt medical treatment to alleviate symptoms and prevent complications. Treatment options may include medications such as corticosteroids to reduce inflammation and antiparasitic drugs to target the underlying cause. In severe cases, surgical intervention may be necessary to relieve pressure on the brain.

Additionally, supportive care such as pain management and hydration is essential for the patient's recovery. Close monitoring by healthcare providers is crucial to ensure the effectiveness of the chosen treatment approach and to manage any potential side effects that may arise.

Treatment options for eosinophilic meningitis typically involve medication to target the underlying cause of the condition.
Antiparasitic drugs, such as albendazole or praziquantel, are commonly prescribed to combat parasitic infections that may be responsible for the meningitis.

In certain cases where the infection is caused by rat lungworm, corticosteroids may be used to reduce inflammation and alleviate symptoms. Supportive care, including pain management and monitoring of neurological symptoms, is also vital in managing eosinophilic meningitis. It is crucial to consult a healthcare provider for an accurate diagnosis and appropriate treatment plan tailored to individual needs.

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What are the Risk Factors Of Eosinophilic Meningitis?

Risk factors for contracting eosinophilic meningitis include consuming raw or undercooked infected snails, slugs, or contaminated produce, as well as poor food hygiene practices. Individuals living in or traveling to regions where these parasites are prevalent are also at a higher risk. It is essential to practice proper food preparation and hygiene methods to reduce the risk of eosinophilic meningitis infection.

Consuming raw or undercooked snails or slugs can increase the risk of developing eosinophilic meningitis.
Traveling to regions where Angiostrongylus cantonensis, the parasite causing eosinophilic meningitis, is prevalent raises the likelihood of infection.
Lack of proper hand hygiene after handling contaminated soil or raw produce can be a risk factor for eosinophilic meningitis.
Drinking untreated water contaminated with the parasite Angiostrongylus cantonensis can lead to eosinophilic meningitis.
Exposure to infected rats or their feces, which may contain the parasite causing eosinophilic meningitis, can heighten the risk of infection.

What is the Recovery Process for Eosinophilic Meningitis?

Recovery depends on the underlying cause, the severity of inflammation, and how quickly treatment is started. Many individuals recover completely, while others may experience persistent neurological symptoms requiring rehabilitation and long-term follow-up.

Taking prescribed medications as directed, attending regular neurology follow-up appointments, getting adequate rest, maintaining good hydration and nutrition, avoiding high-risk foods in endemic regions, and reporting any new neurological symptoms promptly help support long-term recovery.

Recovery Includes

Completing the full course of prescribed medications.
Attending regular neurology and infectious disease follow-up visits.
Getting adequate rest and maintaining hydration.
Participating in rehabilitation if neurological deficits persist.
Following food safety precautions to prevent reinfection.
Monitoring for recurrent headaches or neurological symptoms.

Frequently Asked Questions

1. What are the common signs of eosinophilic meningitis?

Common signs of eosinophilic meningitis include headache, neck stiffness, nausea, vomiting, fever, and neurological symptoms.

2. Are there specific things I should or shouldn't do when dealing with eosinophilic meningitis?

Always follow your healthcare provider's recommendations. Avoid consuming raw or undercooked freshwater fish to prevent infection with the parasite.

3. Can eosinophilic meningitis lead to other health issues?

Yes, eosinophilic meningitis can lead to complications like neurological deficits and vision problems if left untreated.

4. How can eosinophilic meningitis be treated and controlled?

Eosinophilic meningitis can be treated with medications to reduce inflammation and control symptoms. Preventive measures include avoiding contaminated food and water.