Conditions & Treatments

Ornithine transcarbamylase deficiency (OTC) is an inherited disorder that causes ammonia to accumulate in the blood. Ammonia, which is formed when proteins are broken down in the body, is toxic if the levels become too high. ...

Obsessive-compulsive disorder (OCD) is a type of anxiety disorder. A child with OCD has obsessive thoughts that are not wanted. They are linked to fears, such as touching dirty objects. He or she uses compulsive rituals to control the fears, such as excessive handwashing. ...

There are two main forms of COPD: chronic bronchitis, which involves a long-term cough with mucus and emphysema, which involves destruction of the lungs over time. Most people with COPD have a combination of both conditions. ...

Obstructive uropathy occurs when urine cannot drain through a ureter (a tube that carries urine from the kidneys to the bladder). Urine backs up into the kidney and causes it to become swollen (hydronephrosis). ...

Oligodendroglioma is a rare type of glioma brain tumor. This type of brain tumor comes from oligodendrocytes which are cells that make up the supportive, glial tissues of the brain. ...

An omphalocele is a birth defect. It happens when your baby is forming during pregnancy. In this condition, some of your baby’s abdominal organs poke out (protrude) through an opening in the abdominal muscles. This area is in the umbilical cord. A clear (translucent) membrane ...

Siteman Kids, the pediatric oncology program at St. Louis Children’s Hospital, is the largest comprehensive program in Missouri for children with cancer. Learn more, call 314-454-5437. ...

The Children's Eye Center at St. Louis Children's Hospital treats visual disorders that occur in infants and children ranging from refractive error and eye crossing to cataracts and tumors. ...

Oppositional defiant disorder (ODD) is a type of behavior disorder. It is mostly diagnosed in childhood. Children with ODD are uncooperative, defiant, and hostile toward peers, parents, teachers, and other authority figures. They are more troubling to others than they are to themselves. ...

Optic neuritis is a condition that affects the eye and your vision. It occurs when your optic nerve is inflamed. ...