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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).

Hepatoblastoma is a very rare cancer. It’s a tumor that starts in the liver. The cancer cells are similar to fetal liver cells. It usually affects children less than 3 to 4 years of age.

Rhabdomyosarcoma is a type of cancer. It starts in cells that should grow into skeletal muscle cells. Skeletal muscles control voluntary muscle movements. These are movements we can control. This rare cancer is most common in children under age 10.

Wilms tumor is a cancerous tumor that starts in the cells of the kidney. It’s the most common type of kidney cancer in children.

Clubfoot is a deformity of the foot. It's when one or both feet are turned inward. The condition affects the bones, muscles, tendons, and blood vessels. Clubfoot is present at birth. Learn more about clubfoot in children, including what the symptoms are and how it is treated.

In a normal hip joint, the top (head) of the thighbone (femur) fits snugly into the hip socket. In a child with DDH, the hip socket is shallow. As a result, the head of the femur may slip in and out.

Ewing sarcoma is a rare type of cancer. It’s most common in children and teens between ages 10 and 19. It usually grows in bone, but it can also grow in soft tissue that’s connected to the bone. Read on to learn about symptoms, diagnosis, and treatment.

Legg-Calvé-Perthes disease (or Perthes disease) is a rare hip condition that affects children.

Osteosarcoma is cancer of the bone. It is rare, but it is the most common type of bone cancer in children and teens. Learn more about risks, symptoms, diagnosis, treatment, and prevention.