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Metachromatic leukodystrophy is a rare genetic condition in which an abnormal accumulation of fat molecules (sulfatides) affects cells in the nervous system.

Multiple sulfatase deficiency is a complex, inherited disorder caused by a genetic mutation.

Children with mucopolysarcharidosis type II (MPS II) have an abnormal accumulation of complex sugars in their cells, which affects many systems in their bodies.

Myocarditis and pericarditis are inflammatory conditions that affect the heart.

Melanoma is a highly malignant skin cancer that begins in melanocytes — cells that make melanin — of normal skin or moles and spreads rapidly and widely.

Meningitis is a bacterial or viral infection that causes three thin layers of tissue that surround the brain and the spinal cord to swell.

Meningococcal infections are caused by a group of bacteria called Neisseria meningitidis.

A microperforate hymen is when the hymenal membrane extends all the way across the hymenal area with only a very small hole in the center.

Microtia is a birth defect of a baby’s ear in which the external ear is small and not properly formed.