A condition in which there is an intercranial mass which may be primary (formed in the brain) or metastatic (cancers elsewhere in the body that spread to the brain). Brain tumours can also be malignant or benign. The cause of brain tumours is largely unknown. They can occur in people of any age. Symptoms depend on the size and location of the tumour. The most common are headaches, seizures, numbness or tingling in the arms and legs, nausea, vomiting, personality changes, difficulty with movement or balance and changes in hearing, speech, or vision.
A chronic or acute disease of unknown etiological factors that is characterized by unrestrained growth of leukocytes (white blood corpuscles) and their precursors in the tissues. Leukemia is classified according to the dominant cell type and the severity of the disease.
The above terms and definitions are part of the Taxonomy of Human Services, used here by permission of INFO LINE of Los Angeles.