Is a rare inherited genetic defect that produces hyperplasia or malignant tumors in the parathyroid glands, pituitary glands and the pancreas. These tumors (usually benign) cause the glands to secrete high levels of hormones, which can lead to medical problems, such as kidney stones, fertility problems, and severe ulcers. In some cases, tumors inside the pancreas can become cancerous. Also called multiple endocrine adenomatosis or multiple endocrine neoplasia type 1 syndrome. (MEN-1)
