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McCune–Albright syndrome

A genetic disorder affecting bones, skin and hormone production

MCV

An abbreviation for mean cell volume, which is a blood test that gives the average volume of a red blood cell.

MDCT

Multidetector computed tomography. A special kind of computed tomography (CT) scanning that produces more detailed images of the body.

measles

An infection of the respiratory system caused by a virus.

Meckel's diverticulum

A common problem present at birth in which a small hollow, wide-mouthed sac protrudes from the final section of the small intestine.

medial shelf syndrome

A condition of the knee that often follows injury.

mediastinal tumour

A growth that forms in the area that separates the lungs, which contains the heart, large blood vessels, the windpipe, the thymus gland and connective tissue.

meibomian cyst

A round, painful swelling in the upper or lower eyelid caused by an obstruction of one of the glands that lubricates the edge of the eyelid.

melanoma

A malignant tumour arising from pigmented cells or melanocytes, most often in the skin

meningism

Symptoms of neck stiffness, photophobia and headache that mimic meningitis but are due to other causes

meningitis

Inflammation of the membranes covering the brain and spinal cord, due to infection

meningococcal septicaemia

A type of blood poisoning that is caused by the same type of bacteria that cause the most common form of bacterial meningitis.

meningoencephalitis

Inflammation of the brain and the membranes of the brain.

menopausal

Relating to the menopause, the time of a woman’s life when her ovaries stop releasing an egg (ovum) on a monthly cycle.

menopause

The time of a woman’s life when her ovaries stop releasing an egg (ovum) on a monthly cycle, and her periods cease

menorrhagia

Heavy or prolonged menstrual periods.

menstrual cycle

The monthly sequence by which a woman’s body prepares for potential fertilisation of an egg released from the ovaries, involving thickening of the uterus lining and then shedding of the lining when pregnancy does not occur.

menstruation

The shedding of the lining of the uterus (period), as part of the female reproductive cycle.

meralgia paraesthetica

A condition that is caused by pinching of the nerve that passes over the brim of the pelvis and down the thigh, and which causes numbness and burning pain.

mesenteric

relating to the mesentery.

mesenteric infarction

Intestinal injury caused by a lack of blood supply.

mesenteric lymph nodes

Lymph nodes that lie within the membrane that lines the abdominal cavity.

mesentery

the membrane that attaches organs to the abdominal wall

metabolic

Relating to metabolism.