Leptomeningeal Disease: — Symptoms, Diagnosis and Treatment

Your brain and spinal cord are wrapped in three layers of protective tissue called the meninges. They are bathed in a clear fluid called cerebrospinal fluid. Cancer cells that reach this space can grow along the meninges and circulate through that fluid.

This spread often happens even when the rest of the disease is controlled by systemic treatment. The blood-brain barrier — a tight filter around the brain's blood vessels — blocks many drugs from crossing into the brain. Cancer cells that pass through it find a sanctuary where those drugs cannot easily follow.

Breast cancer, lung cancer, and melanoma are among the cancers most associated with leptomeningeal spread. Some blood cancers, including lymphoma and leukaemia, can also involve the meninges. Your oncologist will tell you whether your specific cancer type carries a known tendency toward this pattern.

The symptoms depend on where in the nervous system cancer has established. Headache — often worse in the morning or when lying flat — is common. Double vision, a drooping eyelid, or difficulty swallowing can occur when the cranial nerves are affected.

Weakness or numbness in a limb, difficulty walking, and back or neck pain may occur when the spine is involved. Changes in memory, concentration, or personality can appear even before physical symptoms are noticeable. Report any new neurological symptom to your oncology team, even one that seems minor.

Diagnosis is confirmed by two tests together. An MRI of the brain and spine with gadolinium contrast looks for abnormal enhancement along the meninges. A lumbar puncture takes a small sample of cerebrospinal fluid from your lower back, which is examined for cancer cells. Both tests are usually done because sometimes one is positive while the other is not.

Sudden severe headache, acute loss of vision, or rapidly worsening weakness need same-day emergency assessment. Do not wait for your next scheduled appointment if these appear.

Treatment aims to control the disease, relieve symptoms, and maintain quality of life. The right combination depends on your cancer type, what treatment you have already had, and your overall health.

Radiation to the brain or spine can reduce disease in specific areas and relieve local symptoms. Whole-brain radiation and focused stereotactic approaches are both used depending on the pattern of spread. Your radiation oncologist will advise which fits your situation.

Intrathecal chemotherapy — delivered directly into the cerebrospinal fluid through a lumbar puncture or an Ommaya reservoir — bypasses the blood-brain barrier and allows treatment to reach the meninges directly. Not all chemotherapy agents are suitable for intrathecal use; your oncologist will explain which apply to your cancer.

For some cancer subtypes, systemic treatments that cross the blood-brain barrier more effectively than older agents may be an option. NCCN and ESMO guidance for certain subtypes of lung cancer and breast cancer includes systemic agents with demonstrated activity in the CNS. Your oncologist will assess whether your cancer's molecular profile makes any of these relevant to your situation.

Steroids are often used alongside other treatments to reduce swelling in the nervous system and manage symptoms. Physiotherapy and pain management support quality of life throughout.