This book illustrates 100 classic radiologic signs with radiograms alongside illustrative photographs for memory aids and clarification. Accompanying text explains the history and meaning of the descriptive name. The entry for "dromedary hump," for example, shows a typical x-ray of this condition with a photograph of a dromedary camel that clearly shows how the name fits the sign. Dr. Mulligan says, "In honor of the 100th anniversary of Roentgen's discovery, this book illustrates and elaborates on the history of 100 of the more classic radiologic signs. If we are to use these terms with full understanding, we must have the ability to visualize the object depicted by the term, imagine its radiographic appearance, and transfer that picture to the radiographic image before us. This book is intended to help practitioners and students of our art accomplish that task."