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The American Medical Association considers alcoholism as a disease and supports a classification that includes both physical and mental components. The biological mechanisms that cause alcoholism are not well understood. Social environment, stress, mental health, family history, age, ethnic group, and gender all influence the risk for the condition. Significant alcohol intake produces changes in the brain's structure and chemistry, though some alterations occur with minimal use of alcohol over a short term period, such as tolerance and physical dependence. Magnetic resonance imaging (MRI) is a medical imaging technique used in radiology to investigate the anatomy and physiology of the body in both health and disease. MRI scanners use strong magnetic fields and radiowaves to form images of the body. The technique is widely used in hospitals for medical diagnosis, staging of disease and for follow-up without exposure to ionizing radiation. No date, location or sex was given.