Malignant melanotic nerve sheath tumor with PRKAR1A, KMT2C and GNAQ mutations Malignant melanotic nerve sheath tumor with PRKAR1A, KMT2C and GNAQ mutations Spotty skin pigmentation and multiple blue naevi as cutaneous markers for spinal melanotic schwannoma BMJ Case Reports Pigmented malignant peripheral nerve sheath tumor of the nail unit arising in a patient with neurofibromatosis type I JAAD Case Reports