The tumors discussed in this summary are many and different, and the discussion is arranged in descending order from tumors of the head and neck to tumors of the urinary system and skin. All of these cancers are rare enough that most pediatric hospitals might see fewer than two cases in a year. Most of these tumors are more frequent in adults with cancer; thus, much of the information about these tumors may also be sought through sources relevant to adults with these tumors.

Glossary Terms

A term for diseases in which abnormal cells divide without control. Cancer cells can invade nearby tissues and can spread to other parts of the body through the blood and lymph systems. There are several main types of cancer. Carcinoma is cancer that begins in the skin or in tissues that line or cover internal organs. Sarcoma is cancer that begins in bone, cartilage, fat, muscle, blood vessels, or other connective or supportive tissue. Leukemia is cancer that starts in blood-forming tissue such as the bone marrow, and causes large numbers of abnormal blood cells to be produced and enter the blood. Lymphoma and multiple myeloma are cancers that begin in the cells of the immune system. Central nervous system cancers are cancers that begin in the tissues of the brain and spinal cord.

Having to do with children.

An abnormal mass of tissue that results when cells divide more than they should or do not die when they should. Tumors may be benign (not cancerous), or malignant (cancerous). Also called neoplasm.

Having to do with urine or the organs of the body that produce and get rid of urine.