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Macrocephaly-Capillary Malformation Syndrome

A persistent nevus simplex (port wine stain) as well as a large head. Children also have developmental delays and other malformations, such as extra or enlarged fingers or toes.

Maffucci Syndrome

Vascular malformations in the skin and internal organs and tumors occurring in the bone, causing blue, soft skin lesions on one side of the body, often on the hands and feet.

Magnetic Resonance Imaging (MRI)

MRI is an imaging technique that uses a large magnet, radio frequencies and a computer to produce two- or three-dimensional images of the body.

Malformed Teeth

May result from several conditions including congenital syphilis, cerebral palsy, ectodermal dysplasia, incontinentia pigmenti achromians, cleidocranial dysostosis, for example.

Mallet Finger

An injury involving the last joint of the finger caused either by injury to the extensor tendon or to the bone where it inserts. The extensor tendon straightens the last joint.

Marfan Syndrome

Marfan syndrome is a condition that affects the connective tissues of the entire body, including joints, eyes, heart, blood vessels, lungs, bones & spinal cord.


A bacterial infection within the mastoid, a bone that contains a series of air spaces that connect to the middle ear space.

Meatal Stenosis

A narrowing of the urethral opening (at the tip of the penis where urine comes out), sometimes causing the urine stream to be slow or aim upwards.

Meconium Aspiration Syndrome

A condition that occurs when a yet-to-be-born baby breathes in a mixture of meconium and amniotic fluid, blocking airways, causing breathing difficulty, irritation, and infection.

Medial Collateral Ligament Injuries

Injury to one of the four major ligaments of the knee, connecting the thigh bone to the shinbone, typically by a blow to the outside of the knee or an inward twisting of the knee.

Medial Epicondyle Avulsion Fracture

An elbow injury that occurs most often in young baseball players. These fractures of the bony protrusion inside the elbow, are the most common elbow injury during adolescence.

Medial Tibial Stress Syndrome (Shin Splints)

A condition that causes pain over the shin bone, the most common cause of “shin splints,” the general term used to describe sports-related pain over that bone.