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.

Pneumonia is an infection in the lungs. It can be mild or serious. Pneumonia is generally more common in children younger than 5 years old.

A detailed look at lung transplantation in children, including why it is advised, information about the surgery, and the long-term outlook for a child after a lung transplant.

Detailed information on lower respiratory disorders in children

Detailed information on respiratory disorders in children

Germ cells form as a baby grows in the womb. The cells usually form the eggs (ova) in females and the sperm in males. Germ cell tumors are made up of these underdeveloped cells. The tumors may be cancer (malignant) or not cancer (benign).

Detailed information on limiting protein in your child's diet when they have kidney failure.

Read on for detailed information to help your child limit or avoid high-potassium foods.

Detailed information on the different types of polycystic kidney disease.

Detailed information on controlling phosphorus in your child's diet.