Edited by radiologists from the U. of Washington, U. of Pittsburgh Medical Center, and U. of Colorado Health Sciences Center, this work is intended to serve as a concise guide to the common diagnostic considerations for findings that one may encounter while interpreting computed tomography or magnetic resonance imaging scans. It is meant to be used while at the workstation (or viewbox) in order to have on hand both the list of differential diagnoses of an imaging finding and also the features that can aid in differentiating among common entities. It is organized according to anatomy.