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A genetic condition with thick, leathery skin, “ichthy” coming from the Greek word for fish, this condition is so named as the skin sometimes appears like fish scales.

Idiopathic Toe-walking

Persistent walking on the toes or the balls of the feet, fairly common in kids who are learning to walk.

Iliotibial (IT) Band Friction Syndrome

One of the leading causes of knee pain in runners, occurs when this tendon gets irritated or inflamed from overuse, causing pain and snapping on the outside of the knee.

Immediate Care

Lurie Children's pediatric immediate care centers have extended hours and provide urgent care services for children with unexpected illnesses and injuries.

Immune Thrombocytopenia Pupura

In mild cases, scattered small purple spots on the skin, progressing to increased bruising and nosebleeds and, rarely, bleeding in the GI tract, urinary tract and in the brain.

Imperforate Anus

Birth abnormality caused by improper development of the rectum and anus during pregnancy, the opening at the rectum/anus is absent, so stool cannot leave the body.

Indwelling Feeding Tubes

Lurie Children’s assists parents and caregivers in the proper use of this thin tube inserted into the nose or mouth, through the esophagus and into the stomach, delivering nourishment when other feeding methods are not available.

Infantile Hemangiomas

The most common vascular growth that is seen in infancy, a collection of enlarged blood vessels, may be present at birth but most develop within the first few weeks.

Infantile Spasms Clinic

The team behind Lurie Children’s Infantile Spasms (IS) Clinic has established a guideline and clinic for the diagnosis, etiological work-up, treatment, monitoring, and follow-up of infantile spasms that is supported by the best evidence and expert recommendations.

Infections in Newborns

A fetus and a newborn baby have limited ability to prevent and fight infectiou​s diseases. Special care may be needed for babies who develop an infection before, during, or after birth.

Infectious Diseases

The board-certified physicians at Lurie Children's specialize in treating common and rare pediatric infectious diseases.

Infectious Mononucleosis

Infectious mononucleosis, usually called simply “mono,” usually strikes between 15 and 25 years of age, but can be caught younger. Learn more.