What is essential thrombocythemia?

Learn what is essential thrombocythemia as well as how to identify its signs and symptoms, diagnose it, and treat it. By Raja Narayan. Visit us (http://www.khanacademy.org/science/healthcare-and-medicine) for health and medicine content or (http://www.khanacademy.org/test-prep/mcat) for MCAT rela...