This problem-based guide illustrates key reasoning processes that physicians use to resolve individual clinical problems through the use of electron microscopy. Its format will facilitate learning the case approach for diagnostic ultrastructural pathology using clinical-ultrastructural-pathogenic correlation. A total of 51 cases and a procedural guide for the ultrastructural pathology laboratory are included. The cases were selected according to one of the following four principles: 1) classic cases that were diagnosed readily by light microscopy to facilitate the electron microscopic...