A brain tumor is an abnormal growth of tissue in the brain. The brain is part of the central nervous system (CNS). The CNS also includes the spinal cord.

Chemotherapy is the use of medicines to treat cancer. The medicines can cause an inflammation of the lining of the mouth. The mouth is lined with mucous membranes. When these are inflamed, it’s called mouth mucositis.

Hair loss is a common side effect of chemotherapy. It can affect the hair on the head, and also the eyebrows, eyelashes, and facial and pubic hair. Not all chemotherapy causes hair loss. And not all children lose hair in the same way.

Ewing sarcoma is a rare type of cancer. It’s most common in children and teens between the ages 10 and 19. It usually grows in bone, but it can also grow in soft tissue that’s connected to the bone. This may include tendons, ligaments, ...

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.

Leukemia is cancer of the blood. It’s the most common form of cancer in childhood. The cancer cells grow in bone marrow and go into the blood.

Neuroblastoma is a cancerous tumor. It grows in nerve tissue of babies and young children. The cancer cells grow in young nerve cells of a baby growing in the womb. These cells are called neuroblasts. It’s is the most common cancer in ...

NHL is a type of cancer in the lymphatic system. The lymphatic system is part of the immune system. It helps to fight diseases and infections. The lymphatic system also helps with balancing fluids in different parts of the body.

Retinoblastoma is a rare cancer of the retina of the eye. The retina is in the back of the eye. It’s the part of the eye that receives light. Retinoblastoma is the most common tumor affecting the eye in children. It almost always occurs ...

Rhabdomyosarcoma is a type of cancer. It starts in cells that grow into skeletal muscle cells. The cells are called rhabdomyoblasts. Skeletal muscles control all of a person’s voluntary muscle movements. The cancer is most common in ...

Skin cancer is a type of cancer that grows in the cells of the skin. It can spread to and damage nearby tissue and spread to other parts of the body. Skin cancer is rare in children.

Rhabdomyosarcoma is a type of cancer. It starts in cells that grow into skeletal muscle cells. The cells are called rhabdomyoblasts. Skeletal muscles control all of a person’s voluntary muscle movements. The cancer is most common in ...

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.

Detailed information on actinic keratosis, including causes and treatment.

Adrenal cancer is a rare cancer that starts in the adrenal glands. You have 2 adrenal glands. One sits on top of each kidney. Learn more about symptoms, diagnosis, and treatments.

People who have AIDS are much more likely to get certain types of cancer than people without the disease.

Ampullary cancer, or ampullary carcinoma, is a life-threatening cancer that forms in a body part called the ampulla of Vater in the duodenum, where the pancreatic and bile ducts release their secretions into the intestines.

The anus is the last part of the digestive tract. Most anal cancers start in the cells that make the inside lining of the anus. Learn more about symptoms, diagnosis, and treatments.

Bladder cancer most often starts in the cells that make the inside lining of the bladder. Learn more about symptoms, diagnosis, and treatments.

Breast cancer in men is rare—less than 1% of all breast cancer occurs in men.

Carcinoid tumor is a rare type of tumor that grows slowly.

Cervical cancer is cancer that starts in the cervix. Learn more about symptoms, diagnosis, and treatments.

Colorectal cancer is cancer that starts in either your colon or your rectum. Learn more about symptoms, diagnosis, and treatments.

Detailed information on cutaneous T-cell lymphoma, including symptoms, diagnosis, and treatment.

Endometrial cancer starts in the cells that form the inner lining of the uterus, which is called the endometrium. Learn more about symptoms, diagnosis, and treatments.

Ewing sarcoma is a type of cancer that most often starts in the bone. It can also start in soft tissues. Learn more about symptoms, diagnosis, and treatments.

Primary eye cancer is a very rare kind of cancer that starts somewhere in or on the eye or in the skin of cells around the eye. Learn more about symptoms, diagnosis, and treatments.

Melanoma is a serious kind of skin cancer. This cancer involves cells called melanocytes. You also have melanocytes in your eyes. When these cells become cancerous, the condition is called intraocular melanoma.

Gallbladder cancer starts in the cells that form the gallbladder. Learn more about symptoms, diagnosis, and treatments.