This portable guide to differential diagnosis will help medical residents contextualize clinical findings and effectively order diagnostic imaging modalities, ranging from plain x-ray films to MRI. It is divided into eight sections: musculoskeletal disease and trauma; gastrointestinal disease; genitourinary disease; obstetrics and gynecology; pediatrics; breast disease; chest and cardiac disease; and neurologic and head and neck disorders. Each section features profiles of a range of clinical complexes, with each profile outlining four keys to differential diagnosis: clinical findings; imaging modalities; recommended imaging approaches; and differential diagnostic considerations. Provides guidelines to recommended imaging modalities from a radiologist's perspective.