A subspecialty of pathology having to do with the examination of organs and tissues removed for biopsy. Anatomical pathologists, sometimes called surgical pathologists, examine tissues and organs from biopsies, surgical procedures, or autopsies, with and without using a microscope, to detect the presence of disease and its causes. Tissue samples taken for biopsy can be examined microscopically to detect the presence of cancer cells or to find out whether cancer cells have spread from their site of origin. By using an electron microscope, the pathologist can see viruses and minute parts of individual cells, essential in classifying some kinds of tumors and illnesses. Anatomical pathologists also perform autopsies and examine tissue to determine the cause of a death. Anatomical pathologists present their findings in writing to the doctor who requested testing and provide a diagnosis based on those findings.