This book is a guide for the medical student or recently graduate MD preparing to take the third part (Step 3) of the United States Medical Licensing Exam. As anyone wishing to practice medicine in the United States must take and pass this examination, the potential market is a very large one, with 16,000 new medical school graduates eligible for the exam every year. There are a considerable number of books for the Step 1 Exam (basic sciences) and the Step 2 Exam (clinical medicine) but very few for the Step 3 Exam. It had been common to study for Step 3 using Step 2 materials since both cover clinical medicine, but in recent years the Step 3 exam has separated itself from Step 2, focusing on clinical management of specific medical conditions in a case-scenario fashion. As a result, the few available Step 3 books have become very successful, largely by default.