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A ureterocele is when part of a ureter right near the bladder becomes larger and bulges. This happens because the ureter's opening into the bladder is too small and blocks urine flow.

Severe acute respiratory syndrome (SARS) is a viral illness. It is very contagious and can spread quickly. It can cause mild illness, severe illness, or death.

West Nile fever is an illness caused by a virus. The virus is spread by mosquito bites. It often causes mild, flu-like symptoms.

Eisenmenger syndrome is an advanced form of pulmonary artery hypertension.

An anomalous coronary artery (ACA) is a heart defect. This is something your baby is born with (congenital). In ACA, the blood vessels that supply blood to your child’s heart muscle aren’t normal.

Digestion is the process of breaking down food and drink into smaller parts so that the body can use them to build and nourish cells, and to provide energy.

Burns are classified as first-, second-, or third-degree, depending on how deeply and severely they penetrate the skin's surface.

Acne is a disorder of the hair follicles and sebaceous glands. Hair follicles are the areas around the base or root of each hair. Sebaceous glands are the tiny glands that release oil (sebum) into the hair follicles. The sebum moistens the skin and hair. The sebum and hair get to the skin surface through tiny holes called pores.

In an uncircumcised boy, the foreskin will begin to separate from the tip of the penis. This happens naturally while the boy is a baby. This is called foreskin retraction.