PART I: LIVER SECTION 1: INHERITED, METABOLIC, AND DEVELOPMENTAL DISORDERS Storage Disease, Hepatic Tyrosinemia Niemann-Pick Disease Gaucher Disease Neonatal Hemochromatosis Porphyrin Metabolism Disorders Dubin-Johnson Syndrome Gilbert Disease Progressive Familial Intrahepatic Cholestasis Cystic Fibrosis, Hepatic Hereditary Hemochromatosis Wilson Disease Alpha-1-Antitrypsin Deficiency Congenital Hepatic Fibrosis Polycystic Liver Disease Caroli Disease Lysosomal Lipase Deficiency (Including Wolman Disease) SECTION 2: INFECTIOUS DISORDERS Overview of Hepatitis Acute Viral Hepatitis Hepatitis B Hepatitis C Hepatitis E Epstein-Barr Virus Cytomegalovirus Herpes Simplex Virus Adenovirus Pyogenic Abscess Sepsis in the Liver Mycobacterium tuberculosis Atypical Mycobacteria Cat-Scratch Disease Candidiasis Histoplasmosis Cryptococcosis Amebiasis Schistosomiasis Echinococcosis Syphilis SECTION 3: CHRONIC CHOLESTATIC AND AUTOIMMUNE DISORDERS Autoimmune Hepatitis Primary Biliary Cholangitis Primary Sclerosing Cholangitis Ischemic Cholangitis Large Bile Duct Obstruction Idiopathic Adulthood Ductopenia SECTION 4: PEDIATRIC CHOLESTATIC DISORDERS Biliary Atresia Neonatal Hepatitis Syndromic Paucity of Intrahepatic Bile Ducts (Alagille Syndrome) Nonsyndromic Paucity of Intrahepatic Bile Ducts SECTION 5: DRUG/TOXIN-RELATED HEPATITIS Drug-Induced Acute Hepatitis Drug-Induced Acute Hepatic Failure Drug-Induced Cholestatic Liver Injury Drug-Induced Granulomatous Hepatitis Drug-Induced Steatohepatitis/Phospholipidosis Reye Syndrome Drug-Induced Cholangitis/Ductopenia Hepatic Stellate Cell Hyperplasia SECTION 6: FATTY LIVER DISEASES Alcoholic Liver Disease Metabolic Dysfunction-Associated Steatohepatitis Glycogenic Hepatopathy Fatty Liver of Pregnancy SECTION 7: VASCULAR DISORDERS Metabolic Dysfunction-Associated Steatohepatitis Obliterative Portal Venopathy Hepatic Venous Outflow Obstruction Venoocclusive Disease Amyloidosis Ischemia Nodular Regenerative Hyperplasia SECTION 8: TRANSPLANTATION PATHOLOGY Ischemia Reperfusion Injury Antibody-Mediated Rejection T-Cell-Mediated Rejection (Acute Cellular Rejection) Chronic Rejection Central Perivenulitis/Parenchymal Rejection Hepatic Artery Thrombosis Graft-vs.-Host Disease SECTION 9: TUMORS OF THE LIVER Hepatocellular Adenoma Focal Nodular Hyperplasia Regenerative and Dysplastic Nodules Hepatocellular Carcinoma and Variants Fibrolamellar Carcinoma Combined Hepatocellular-Cholangiocarcinoma Hepatoblastoma Bile Duct Adenoma von Meyenburg Complex (Biliary Microhamartoma) Mucinous Cystic Neoplasm, Liver Intrahepatic Cholangiocarcinoma Intrahepatic Cholangiocarcinoma, Histologic Subtypes Intraductal Papillary Neoplasm of the Bile Duct Hemangioma Angiomyolipoma Hepatic Small Vessel Neoplasm/Anastamosing Hemangioma Epithelioid Hemangioendothelioma Infantile Hemangioma Angiosarcoma Mesenchymal Hamartoma Embryonal Sarcoma Inflammatory Pseudotumor Segmental Atrophy (Nodular Elastosis) Hepatectomy Specimen Handling SECTION 10: MISCELLANEOUS HEPATIC DISORDERS Langerhans Cell Histiocytosis Hemophagocytic Lymphohistiocytosis PART II: PANCREAS AND BILIARY TRACT SECTION 1: DEVELOPMENTAL/CONGENITAL Congenital Pancreatic Cyst Cystic Fibrosis, Pancreatic Nesidioblastosis Choledochal Cyst SECTION 2: INFLAMMATORY DISORDERS OF THE GALLBLADDER AND EXTRAHEPATIC BILIARY TREE Cholelithiasis Acute Cholecystitis Chronic Cholecystitis Xanthogranulomatous Cholecystitis Eosinophilic Cholecystitis Polyarteritis Nodosa and Other Vasculitides Parasitic Infection SECTION 3: NONNEOPLASTIC AND INFLAMMATORY DISORDERS OF THE PANCREAS Acute Pancreatitis Chronic Pancreatitis Autoimmune Pancreatitis Groove Pancreatitis Infectious Pancreatitis Pseudocysts Diabetes Mellitus Lymphoepithelial Cyst of the Pancreas SECTION 4: TUMORS OF THE GALLBLADDER AND EXTRAHEPATIC BILIARY TREE Noninvasive Epithelial Polypoid Lesions Carcinoma of Gallbladder Carcinoma of Extrahepatic Bile Ducts Squamous/Adenosquamous Carcinoma, Gallbladder Neuroendocrine Neoplasms of Gallbladder Granular Cell Tumor Embryonal Rhabdomyosarcoma Adenomyoma Nonneoplastic Polypoid Gallbladder Lesions SECTION 5: TUMORS OF THE PANCREAS Pancreatic Intraepithelial Neoplasia Ductal Adenocarcinoma, Including Histologic Subtypes Undifferentiated Carcinoma Adenosquamous Carcinoma, Pancreas Acinar Cell Carcinoma Serous Cystadenoma Acinar Cystic Transformation of the Pancreas Well-Differentiated Neuroendocrine Tumor, Pancreas Poorly Differentiated Neuroendocrine Carcinoma, Pancreas Simple Mucinous Cyst Mucinous Cystic Neoplasm, Pancreas Intraductal Papillary Mucinous Neoplasm Intraductal Oncocytic Papillary Neoplasm Intraductal Tubulopapillary Neoplasm Solid Pseudopapillary Neoplasm Pancreatoblastoma Dermoid Cyst Specimen Handling, Whipple SECTION 6: TUMORS OF THE AMPULLA Ampullary Adenoma Ampullary Adenocarcinoma and Histologic Subtypes Well-Differentiated Neuroendocrine Tumor, Ampulla Composite Gangliocytoma/Neuroma and Neuroendocrine Tumor.