This is the first in a new series of Atlases in an innovative teaching file approach for radiology residents and clinicians. Each chapter has the same uniform format:: a brief description of clinical disorders and diseases, followed by case studies using all the different modalities:: ultrasound, radiographs, CTs, and MRIs. The text and illustrations demonstrate the progression of the disease states and the most optimal modality for each condition. Each chapter has a concise reference section.