Blastoma is abnormal cell growth of precursor or immature cells. These cells have yet to develop into cells with specific organ function. As a result, the symptoms that arise from these tumors vary greatly, since they are determined by their location in the body. Blastomas can occur in every part of the body, such as the brain, liver, kidneys, nervous system, bones and even the retina. Blastomas are usually found in children and are harder to diagnose due to their variability. Treatment is developed on a case-by-case basis and depends on the specific needs of the patient. If blastomas are found, doctors may suggest chemotherapy to combat the tumor problems.