Hirschsprung Disease in an Infant with L1 syndrome: Report of a New Case and a novel variant.

L1syndrome is an X-linked disorder manifesting with congenital hydrocephalus, adducted thumbs and spasticity. There are rare cases of L1 syndrome and coincident Hirschsprung disease, with mutations in the gene thought to underlie both. We present a novel pathogenic variant in someone with L1 syndrome and Hirschsprung disease.