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ORPHA:252046Disease
What it is
A rare nervous system tumor characterized by a benign pigmented space-occupying lesion derived from leptomeningeal melanocytes. Symptoms typically show insidious onset and are related to the mass effect on adjacent tissues. Depending on the location of the tumor, they include focal neurological deficits, increased intracranial pressure, seizures, and spinal cord compression, among others. Although the tumor may behave aggressively, prognosis is good after complete surgical resection.
Key facts
- Classified as
- Disease
Recorded for the broader condition
- Prevalence
- <1 / 1 000 000 (annual incidence, United States)Primary melanocytic tumor of central nervous system
Orphanet records these for the broader condition rather than for this specific form. They are a starting point, not a figure for this subtype — subtypes often differ, and some are defined by being rarer than the condition they sit under.
ICD-10 codes
ICD-10 has no distinct code for most rare diseases, so many are filed under the nearest available one. A shared code identifies the group, not this disease — the ORPHAcode above is what identifies it.
Cross-references
Orphadata Science: Free access data from Orphanet. © INSERM 1999. Data version 2026-06-23. Available under CC BY 4.0. This is a reference, not medical advice.
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