In five chapters integrating histopathology, radiology, and clinical features with outstanding illustrations and tables, this fascicle characterizes the broad scope of lesions encountered in the anatomic pathology of non-neoplastic endocrine diseases. The pathologic features of the lesions with detailed histological, cytological, ultrastructural immunohistochemical, and, in some cases, molecular biologic findings are explained systematically. Issues of differential diagnosis are discussed in detail.