MEN1 and multiple endocrine neoplasia type 1: Neuroendocrine neoplasms (NENs) represent a complex family of tumors arising sporadically or occurring in the context of hereditary syndromes such as multiple endocrine neoplasia type 1 (MEN1), multiple endocrine neoplasia type 2 (MEN2), multiple endocrine neoplasia type 4 (MEN4), Von Hippel–Lindau (VHL) disease neurofibromatosis type 1 (NF1), and tuberous sclerosis [1].