What is pheochromocytoma Pheochromocytomas (also known as adrenal chromaffin tumor) are rare tumors that start in the inner section of the adrenal gland (the chromaffin

What is chordoma A chordoma is a rare primary bone and soft tissue tumor cancer (a type of sarcoma) that usually occurs along the spine from

What is rickets Rickets is a condition that causes children to have soft, weak bones. Rickets usually occurs when children do not get enough vitamin

What is Legionnaires disease Legionnaires' disease is an uncommon severe and sometimes life-threatening form of pneumonia, or lung inflammation caused by Legionella bacteria. Legionella bacteria is

What is ehrlichiosis Ehrlichiosis is the general name used to describe several bacterial diseases transmitted by ticks that affect animals and humans. The signs and symptoms

What is premature ovarian failure Premature ovarian failure (also called primary ovarian insufficiency) is the term used to describe the depletion or dysfunction of ovarian

What is pyloric stenosis Pyloric stenosis (also called hypertrophic pyloric stenosis) is an uncommon condition in infants where there is a narrowing of the pylorus,

What is Peyronie's disease Peyronie’s disease is a disorder in which fibrous scar tissue, called a plaque, forms inside the penis. The plaque (scar tissue)

What is mumps Mumps (or “the mumps”) is a contagious viral infection (mumps virus) that is most common in children between two and 15 years of

What is phenylketonuria Phenylketonuria (commonly known as PKU) is an inherited disorder of deficiency of hepatic phenylalanine hydroxylase activity needed to convert the essential amino acid