This volume builds upon the work of its predecessor in the third series of the Atlas of Tumor Pathology, liberally illustrating the spectrum of each tumor and disease described, while providing many new illustrations. Morphometry, flow cytometry, immunohistochemistry, gene rearrangement studies, and other molecular biologic methodologies are exciting new areas that are being developed into diagnostic procedures in the pathology laboratory. Where these methodologies are applicable to salivary gland disease, they are included. Histomorphologic evaluation, however, remains the principal and most useful method for diagnosis of salivary gland tumors and is the emphasis of this Fascicle. A differential diagnosis is included in the discussion of most tumors, and the cytopathologic features of those tumors most commonly encountered in the cytopathology laboratory are discussed.