Neurocutaneous melanosis
Neurocutaneous melanosis is a congenital disorder characterized by the presence of congenital melanocytic nevi on the skin and melanocytic tumors in the leptomeninges of the central nervous system . 
<triplet> leptomeninges <subj> central nervous system <obj> part of <triplet> central nervous system <subj> leptomeninges <obj> has part