Pathology: Pathology is "the science of the causes and effects of diseases, especially the branch of medicine that deals with the laboratory examination of samples of body tissue for diagnostic or forensic purposes." According to Google. http://explorehealthcareers.org/en/Career/121/Pathologist
http://www.news-medical.net/health/What-is-Pathology.aspx (WARNING: Certain images may be unsettling. Those images are labeled, "gross".)