[Neurocutaneous melanosis]

Area of Science:

• Neurology
• Dermatology
• Pathology

Background:

• Neurocutaneous melanosis (NCM) is a rare congenital syndrome.
• It is characterized by large or multiple melanocytic nevi and pigmented leptomeningeal tumors.
• The condition arises from an embryological defect, specifically a neural crest cell migration defect.

Purpose of the Study:

• To describe the morbidity and mortality associated with neurocutaneous melanosis.
• To report a fatal case of NCM in a pediatric patient.
• To emphasize the importance of early diagnosis for potentially improving patient outcomes.

Main Methods:

• Retrospective review of medical and necropsy reports.
• Comprehensive bibliographic research utilizing MEDLINE, LILACS, and Index Medicus databases.

Main Results:

• A 1-year-old male presented with seizures, progressing to coma and death within hours.
• Necropsy revealed diffuse leptomeningeal malignant melanoma affecting the brain stem, cerebellum, spinal cord, and temporal lobe.
• The findings were associated with a giant melanocytic nevus and satellite lesions.

Conclusions:

• Neurocutaneous melanosis has a poor prognosis, as exemplified by the reported case.
• The underlying pathophysiology involves a defect in primitive neural crest cell migration.
• Early diagnosis of NCM may offer a chance to improve survival time.