This book contains general medical information and is intended to provide the patient and family with tools to enhance the communication process and to understand the information they receive from the healthcare team. Most importantly, this book is not intended to suggest diagnostic approaches or to recommend specific therapy for any patient. Each patient’s condition and treatment is unique and the management of their illness should be customized to their individual medical needs. Medical knowledge and practice can change rapidly. Therefore, this book should not be used as a substitute for professional medical advice.