Recognizing Emergency Warning Signs and Symptoms

Living with Diffuse Leptomeningeal Melanocytosis (DLM) or Neurocutaneous Melanosis (NCM) requires a careful balance of vigilance. Because the pigment cells occur within the confined space of the skull and spinal canal, they can interfere with the brain’s natural fluid balance ^[1][2].

While many days may pass without incident, you must be prepared to recognize when a symptom is a minor issue and when it is a life-threatening emergency. This page details the specific “red flags.” You should always follow your patient-specific emergency plan from your treating team for any new or worsening symptom.

Symptoms to Monitor

It is common for children and adults with DLM to experience occasional mild headaches, fatigue, or stable, long-term neurological differences (like a slight developmental delay or an existing, well-controlled seizure disorder) ^[3]. If a symptom is familiar, stable, and not worsening, you should still discuss these with your care team during your next scheduled update or call for advice. However, if a familiar symptom becomes more intense, lasts longer, or occurs with a change in alertness, it requires urgent clinician evaluation.

Emergency Red Flags: Go to the ER Now

Certain symptoms indicate acute hydrocephalus (a rapid buildup of fluid), a dangerous spike in intracranial pressure (ICP), spinal cord compression, or a stroke-like event. In a specific review of cases, 67% of patients experienced increased intracranial pressure ^[4]. These spikes can be fatal if not treated immediately by a neurosurgeon ^[5].

Seek emergency care immediately if you observe:

• Intractable Vomiting: Vomiting that is sudden, forceful, or occurs alongside a severe headache or altered alertness, which is different from a typical stomach bug ^[6][1].
• Extreme Lethargy: Difficulty waking the person or a state where they are unusually “floppy,” confused, or unable to stay awake ^[7][8].
• Severe, “Thunderclap” Headache: A headache that reaches its maximum, worst intensity almost instantly (within seconds to a minute), or one that wakes them from sleep and does not respond to typical pain relievers ^[6][8].
• Sudden Neurological Deficits: A new facial droop, sudden loss of vision, double vision (diplopia), a new “cross-eyed” appearance (strabismus), new difficulty swallowing, or sudden major gait changes ^[9][6].
• Progressive Weakness: A new, sudden, or rapidly worsening weakness in the arms or legs, or sudden loss of bowel or bladder control, which can indicate spinal cord compression ^[3][7].
• Infant-Specific Signs: In babies whose skull bones haven’t fused, look for a tense or bulging fontanelle (the soft spot on top of the head), widely separated skull sutures, or “sunsetting eyes” where the eyes appear to be looking permanently downward ^[1][10].
• Status Epilepticus: Any seizure that lasts longer than the time specified by your doctor (often five minutes), or multiple seizures where the person does not wake up in between ^[5][11].

Understanding Seizures in DLM

Seizures are common in this condition, occurring in approximately 55% of reported cases ^[3]. They happen because the pigment cells can irritate the brain’s electrical pathways.

• Convulsive Seizures: These involve stiffening and shaking of the body. They are the easiest to recognize ^[12].
• Non-convulsive Status: This is a subtle but dangerous emergency. The person may appear to be “staring into space,” be intensely confused, or exhibit repetitive, purposeless movements (like lip-smacking) for an extended period without “coming back” to their normal self ^[5].

Basic Seizure First Aid:
Do not restrain the person or put anything in their mouth. Protect them from injury, place them on their side when it is safe to do so to keep the airway clear, and carefully time the seizure. If you have a rescue medication prescribed, ensure you follow the exact, individualized instructions provided by your prescriber. If the seizure does not stop after the rescue medication is given according to your plan, call 911 or your local emergency number immediately.