Medical Dictionary Definitions A-Z List
Medical Dictionary Definitions A - Z - «S»:
Schizophrenia, childhood: The onset of
schizophrenia before adulthood. This condition is very rare
in young children, but occurs with more frequency in the
teenage years. Autism was once known as childhood
schizophrenia, but is a completely different disorder. See
also autism, childhood disin...
Schizotypal personality disorder
Schizotypal personality disorder: A type of personality
characterized by unusual patterns of speech and
behavior and by social withdrawal.
See also Asperger syndrome.
Schmorl's node: An upward and downward protrusion (pushing into) of a spinal disk's soft tissue into the bony tissue of the adjacent vertebrae (the bony building blocks of the spine). Schmorl's nodes are detectable with an x-ray test as a spine abnormality . Schmorl's nodes are most common in the m...
Schönlein-Henoch purpura: A form of blood vessel inflammation (vasculitis) that typically affects small
arterial vessels (capillaries) in the skin, kidneys, and intestinal tract. The disease presents characteristically as a skin rash
associated with joint inflammation (arthritis) and cramping...
School, first American medical
School, first American medical: See: First American medical school....
School, medical: See: Medical school....
Schwartz-Jampel syndrome: A syndrome characterized by short stature, blepharophimosis (horizontal narrowing of the eye slits), joint limitation, and myotonia (prolonged muscle contractions with a delay in relaxation) The syndrome is inherited in an autosomal recessive manner and is due to mutations ...
Sciatic nerve: The largest nerve in the body, the sciatic nerve begins from nerve roots in the lumbar part of the spinal cord (in the low back) and extends through the buttock area to send nerve endings down to the legs.
Pain resulting from irritation of the sciatic nerve is called sciatica. The pa...
Sciatica: Pain resulting from irritation of the
typically felt from the low back to behind the thigh and radiating
down below the knee. While sciatica can result from a herniated disc directly pressing on the
nerve, any cause of irritation or inflammation of this nerve can
SCID: Severe combined immunodeficiency disease....
Science (journal): A weekly journal concerning science.
Science was founded in 1880 by one of the world's most famous scientists, Thomas Alva Edison, inventor of the light bulb.
Science is the world's general scientific publication with the largest circulation. For the sake of comparison, Science's...
Science, cognitive: Cognitive science is the study of the mind. It is an interdisciplinary science that draws upon many fields including neuroscience, psychology, philosophy, computer science, artificial intelligence, and linguistics.
The purpose of cognitive science is to develop models that help...
Scientist, medical: See: Medical scientist....
Scintigraphy: A diagnostic test in which a two-dimensional picture of a body radiation source is obtained through the use of radioisotopes. For example, scintigraphy of the biliary system (cholescintigraphy) is done to diagnose obstruction of the bile ducts by a gallstone, a tumor, or another proble...
Scintimammography: A scintigraphic imaging technique that uses the radioisotope technetium tetrofosmin (Tc-99 tetrofosmin) to search for breast cancer. Scintimammography can sometimes detect breast cancer in situations in which there is considerable uncertainty, as with dense breast tissue. Dense b...