Pathology is the field of medicine concerned with the study of diseases and their causes. It focuses on the diagnosis of clinical conditions by analyzing cell, tissue and body fluid samples. It is also concerned with understanding the disease pathways of particular pathogens and disorders, which affects the tissues of discrete organs or structures. Much of the practice of pathology is concerned with the diagnoses of different cancers and investigating the staging of cancerous masses, through blood tests, biopsy and resection. The diagnostic tools of pathology are of immense importance in the investigation of serious infectious diseases. It is primarily divided into anatomical and clinical pathology. Diagnostic pathology is an important field in modern medical diagnosis and has outreach in medical research. This is due to a significant overlap with other diagnostic medicine such as medical imaging, thus allowing detailed insight into internal physiology. This book contains some path-breaking studies in the field of diagnostic pathology. It discusses the traditional as well as modern paradigms of diagnostic pathology. For all readers who are interested in this field, the case studies included in this book will serve as an excellent guide to develop a comprehensive understanding.