Megacolon
An abnormally enlarged colon. Megacolon can arise as a serious congenital problem in the newborn, caused by abnormal innervation of the colon and frequently requiring surgery.
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- Megakaryocyte
A giant cell in the bone marrow that is the ancestor of blood platelets, which are essential to normal blood clotting.
- Megalencephaly
Also called macrencephaly, a condition in which there is an abnormally large, heavy, and usually malfunctioning brain. By definition, the brain weight is greater than average for the age and gender of the child. Head enlargement may be evident at birth or the head may become abnormally large in the early years of life. Megalencephaly […]
- Megrim
Migraine. Usually periodic attacks of headaches on one or both sides of the head. Megrim (migraine) may be accompanied by nausea, vomiting, increased sensitivity of the eyes to light (photophobia), increased sensitivity to sound (phonophobia), dizziness, blurred vision, cognitive disturbances, and other symptoms. Some megrims (migraines) do not include headache. They may or may not […]
- Meibomian cyst
An inflammation of the oil gland of the eyelid. Also known as chalazion or tarsal cyst.
- Meibomian gland
A type of gland in the eyelids that makes a lubricant called sebum which is discharged through tiny openings in the edges of the lids. The meibomian glands can become inflamed, a condition termed meibomianitis or meibomitis, due to allergy, acne in adolescence, and rosacea. Chronic inflammation of the meibomian glands leads to cysts, called […]