These notes were developed to assist in the review of the basic science of pathology for those students preparing to sit for various national proficiency examinations which include, as part of their content, material dealing with general and systemic pathology. As such, the notes are not intended to replace the many fine textbooks of pathology whose scope, detail, and mission are more suited to the in depth study of pathology. Rather, these notes are intended to serve as "e;memory joggers"e; to rekindle and refresh the mind of some of the salient features of various disease processes and to point out to the student possible areas of weakness which they may need to address in more detail by referring to one of the standard textbooks of pathology. In this regard, these notes are presented in an organized and sensible (we hope!) outline format which is intended to allow systematic review of the material in a reasonable amount of time. In an effort to contain cost and avoid undue repetition with other volumes of the Oklahoma Notes series, some topics that are generally covered in most standard pathology courses as well as illustrative material have been omitted from the present edition. The authors would like to extend our sincere gratitude to the faculty and staff of the Department of Pathology for their ideas, support, and assistance during the preparation of these notes. In particular, we would like to thank Drs. K.