Pigmented Birthmarks and Spinal Neurofibromas in KRAS Mosaicism-Not to Be Confused With NF1.

We report a child presenting with pigmentary skin lesions and spinal neurofibromas who was diagnosed molecularly with KRAS mosaicism. We review the previous literature of two cases of congenital skin lesions and neurofibromas and spinal nerve root hypertrophy caused by KRAS variants and highlight this presentation as an important differential diagnosis for neurofibromatosis.