Histopathology is a scientific study of disease at the tissue and cellular levels. Despite an old practice, the histopathology reserved one of the substantial sections of disease studies, both in medical and veterinary field in the modern scientific era. During the current molecular age, some improvements have been made in this practice. The early modification in histopathology is the introduction of staining and fixation of tissues, which playing an incredible role in tumor diagnosis. The new developments, including microtomy and use of cryostat. The sections can be further used for imaging studies and comparative analysis for various disorders including cancer histology can be related with pathological modifications by such novel technologies and almost changed the previous ordinary diagnostic methods. The existing molecular pathobiology has evolved mainly from biopsy and autopsy. Currently, the revolutions in molecular biology and in the technology of gene array have developed. The telepath logical staining is helping the society and deals with histopathological pictures. It is not far, when molecular techniques would be applied to the lesions prior to its paraffinizations, and the histopathological experts would previously recognize what to study in the sections. The productive move from a visual morphological explanation to obscure molecular science, may be delay, but ultimately will be there. This book tries to express few of such characteristics of the histopathological practice which assured to be the fast progressing portion of the modern science.
