Caused by somatic mutation in the HRas proto-oncogene, GTPase gene (HRAS, 190020.0017) [MOLECULAR BASIS] Caused by somatic mutation in the NRAS proto-oncogene, GTPase gene (NRAS, 164790.0002) [MOLECULAR BASIS] Onset at birth [MISCELLANEOUS] Relatives with multiple small congenital pigmented nevi [MISCELLANEOUS]
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