Hereditary pituitary tumours can also be part of syndromic disease accompanied by other manifestations, often tumours of other endocrine organs, such as in multiple endocrine neoplasia type 1 (MEN1), multiple endocrine neoplasia type 4 (MEN4), MAS, CNC, or phaeochromocytoma/paraganglioma (PPGL)-pituitary adenoma association [18,19,20,21,22,23,24,25] (Table 1). This evidence concerns the gene MEN1 and multiple endocrine neoplasia type 1.