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Glossary: neurofibromatosis type 1, Masonic Cancer Center, University of Minnesota

neurofibromatosis type 1

(NOOR-oh-FY-broh-muh-TOH-sis ...)

A rare genetic condition that causes brown spots and tumors on the skin, freckling in skin areas not exposed to the sun, tumors on the nerves, and developmental changes in the nervous system, muscles, bone, and skin. Also called NF1.