Multiple endocrine neoplasia (MEN)... Health Article

Definition

Multiple endocrine neoplasia (MEN) I is an inherited disorder in which one or more of the endocrine glands are overactive or form a tumor. Endocrine glands most commonly involved include:

• Adrenals
• Pancreas
• Parathyroid
• Pituitary
• Thyroid

Alternative Names

Wermer syndrome; MEN I

Causes, incidence, and risk factors

MEN I is caused by a defect in a gene called RET. The condition causes tumors of various glands to appear in the same person, but not necessarily at the same time. The disorder may occur at any age, and it affects men and women equally.

Risk factors for MEN I include:

• Family history of this disorder
• Pituitary tumor
• Zollinger-Ellison syndrome

Symptoms

Symptoms vary from person to person, and may include:

• Abdominal pain
• Anxiety
• Black, tarry stools
• Bloated feeling after meals
• Burning, aching, or hunger discomfort in the upper abdomen or lower chest that is relieved by antacids, milk, or food
• Decreased sexual interest, loss of body or facial hair (in men)
• Fatigue
• Headache
• Lack of menstrual periods, infertility, or failure to produce breast milk (in women)
• Loss of appetite
• Loss of coordination
• Loss of underarm or pubic hair
• Mental changes or confusion
• Muscle pain
• Nausea and vomiting
• Sensitivity to the cold
• Unintentional weight loss
• Vision problems
• Weakness

Signs and tests

Signs may include:

• Coma (if low blood sugar is untreated)
• High blood calcium
• Kidney stones
• Low blood pressure
• Low blood sugar
• Pituitary problems (such as too much prolactin, a hormone that controls breast milk production)

Tests to diagnose MEN I may include:

• Cortisol
• Cranial CT scan
• CT of abdomen
• Fasting blood sugar
• Insulin test
• MRI of the abdomen
• MRI of the head
• Parathyroid biopsy
• Serum adrenocorticotropic hormone
• Serum calcium
• Serum follicle stimulating hormone
• Serum gastrin
• Serum glucagon
• Serum luteinizing hormone
• Serum parathyroid hormone
• Serum prolactin
• Serum thyroid stimulating hormone (rarely used)