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.

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.

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.

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

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

Learn more about the effects that testosterone may have on your body and an approximate timeline of these changes.

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

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 is a condition that occurs when a newborn infant breathes in a mixture of meconium and amniotic fluid. Learn about treatment here.

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.

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.