Immunology Immune Response in Organ Transplantation Regulatory Immune Cells and Transplant Tolerance NK Cells Complement Laboratory-Based Immune Monitoring in Organ Transplantation HLA Testing Human Leukocyte Antigen System Histocompatibility Testing Transplantation and HLA ABO Blood Group Antigens and Transplantation Apheresis and Transplantation HLA and Transfusion Immunosuppressive Drugs Mechanism of Action of Immunosuppressive Drugs Therapeutic Drug Monitoring in Transplant Patients History of Immunosuppression Drugs in Transplantation Kidney Transplantation History of Kidney Transplantation Pathologic Classification of Renal Allograft Diseases Evaluation of the End-Stage Kidney Evaluation of Allograft Kidney Evaluation of the Donor Kidney Evaluation of Transplant Nephrectomy Evaluation of Fibrosis Protocol Biopsies Accommodation Tolerance Surgical Complications Acute Allograft Ischemia Urine Leak Lymphocele Renal Artery or Vein Thrombosis Transplant Renal Artery Stenosis Allograft Rejection Hyperacute Rejection Acute T-Cell-Mediated Rejection Chronic T-Cell-Mediated Rejection Acute Antibody-Mediated Rejection Chronic Antibody-Mediated Rejection Recurrent Diseases Diseases That Recur in Allografts De Novo Diseases De Novo Focal Segmental Glomerulosclerosis De Novo Membranous Glomerulonephritis Anti-GBM Disease in Alport Syndrome Hyperperfusion Injury Engraftment Syndrome Kidney Diseases in Nonrenal Transplant Recipients Graft-vs.-Host Glomerulopathies Drug Toxicities Calcineurin Inhibitor Toxicity mTOR Inhibitor Toxicity Infections Acute Pyelonephritis Polyomavirus Nephritis Adenovirus, Kidney Cytomegalovirus Infection Histoplasmosis Candidiasis Cryptococcosis Mucormycosis Aspergillosis Coccidioidomycosis Paracoccidioidomycosis Microsporidiosis Tuberculosis Malakoplakia Nocardiosis Liver Transplantation Pathologic Classification of Liver Allograft Diseases Gross Evaluation of Failed Native Liver Evaluation of Failed Liver Allograft Evaluation of the Donor Liver History of Liver Transplantation Posttransplant Surgical Complications Preservation Injury Hepatic Artery Thrombosis Portal Vein Thrombosis Bile Duct Stricture, Leak, Sludge, Biloma Hepatic Venous Outflow Obstruction Hyperperfusion Syndrome Allograft Rejection Acute Cellular Rejection, Liver Antibody-Mediated Rejection, Liver Chronic (Ductopenic) Rejection Recurrent Diseases In Liver Allograft Recurrent Hepatitis B Virus Recurrent Hepatitis C Virus Fibrosing Cholestatic HBV or HCV Hepatitis Recurrent Autoimmune Hepatitis Recurrent Primary Biliary Cholangitis Recurrent Primary Sclerosing Cholangitis Recurrent Fatty Liver Disease Infections Cytomegalovirus Herpes Simplex Virus Adenovirus, Liver Hepatitis E Virus Epstein-Barr Virus, Liver Fungal Infections, Liver Late-Graft Dysfunction Plasma Cell-Rich Rejection Graft-vs.-Host Disease, Liver Heart Transplantation Pathologic Classification of Cardiac Allograft Diseases Evaluation of Failed Native and Transplanted Heart History of Heart Transplantation Evaluation of Explanted Heart Ischemic Heart Disease Dilated Cardiomyopathy Hypertrophic Cardiomyopathy Congenital Heart Disease Sarcoidosis, Heart Arrhythmogenic Right Ventricular Cardiomyopathy Other Causes of End-Stage Heart Disease Allograft Rejection Acute Cellular Rejection, Heart Antibody-Mediated Rejection, Heart Chronic Allograft Vasculopathy, Heart Noninfectious Lesions Quilty Lesions Site of Previous Biopsy Infections Myocarditis Lung Transplantation Pathologic Classification of Lung Allograft Diseases Examination of Native and Transplanted Lungs History of Lung Transplantation Evaluation of Failed Native Lung Emphysema Cystic Fibrosis Idiopathic Pulmonary Fibrosis Connective Tissue Disease-Associated Lung Disease Sarcoidosis, Lung Pulmonary Arterial Hypertension Other Causes of End-Stage Lung Disease Surgical Complications Surgical Aspects and Complications, Lung Allograft Rejection Pathologic Classification of Rejection Antibody-Mediated Rejection, Lung Acute Cellular Rejection, Grade A Acute Cellular Rejection, Grade B Chronic Allograft Dysfunction, Lung Noninfectious Lesions Organizing Pneumonia Microaspiration Infections Bacterial Infections Viral Infections Fungal Infections, Lung Intestinal Transplantation Pathologic Classification of Intestinal Allograft Diseases Indications and Evaluation of Explant Reperfusion Injury History of Intestinal and Multivisceral Transplantation Allograft Rejection/Immunological Injury Acute Antibody-Mediated Rejection, Intestine Acute Cellular Rejection, Intestine Chronic Rejection, Intestine Stomach Rejection Colon Rejection Graft-vs.-Host Disease, Intestine Infections Bacterial and Fungal Infections Adenovirus, Intestine Rotavirus, Cytomegalovirus, and Herpes Simplex Virus Epstein-Barr Virus, Intestine Pancreas Transplantation Pathologic Classification of Pancreas Allograft Diseases Clinical Considerations in Pancreas Transplant Evaluation History of Pancreas Transplantation Surgical Complications Surgical Aspects and Complications, Pancreas Allograft Rejection Acute Cellular Rejection, Pancreas Antibody-Mediated Rejection, Pancreas Chronic Allograft Rejection/Graft Sclerosis Graft Dysfunction Recurrent Diabetes Mellitus Islet Cell Toxicity and Islet Amyloid Deposition Infections Intraabdominal and Opportunistic Infections Vascularized Composite Allotransplantation History of Vascularized Composite Allotransplantation Allograft Rejection Acute T-Cell- and Antibody-Mediated Rejection Chronic Rejection Posttransplant Neoplastic Disorders Posttransplant Lymphoproliferative Disease.