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A septate hymen is when, because of an extra band of tissue in the middle, there are two smaller openings to the vagina instead of one.

Severe combined immunodeficiency (SCID), often called “bubble boy disease,” is very rare, genetic disorder.

Apert syndrome is a genetic disorder that causes fusion of skull, hands, and feet bones. Learn more from Boston Children's.

Sexually transmitted diseases (STDs) and sexually transmitted infections (STIs) are infectious diseases spread through sexual contact.

“Shin splints” is a catch-all term for tenderness and pain in the area of the shin bone (tibia).

Sanfilippo syndrome (aka mucopolysaccharidosis type III (MPS III)) is a rare, inherited disorder that's classified as a lysosomal storage disorder (LSD).

Sports-related eye injuries often are caused by blunt trauma to the eye by an object.

Shwachman-Diamond syndrome (SDS) is a rare, inherited bone marrow failure, characterized by a low number of white blood cells, poor growth due to difficulty absorbing food, and, in some cases...

Sickle cell disease is an inherited blood disorder where cells cluster together, making it difficult for them to move through small blood vessels, thus denying oxygen to the blood.

A single ventricle defect occurs when one of the two pumping chambers in the heart, called ventricles, isn’t large enough or strong enough to work correctly.