1 The Cardiovascular System.- Normal Anatomic Features.- Pericardium.- Myocardium.- Endocardium.- Arteries.- Veins.- Lymphatics.- Heart.- Pericardium.- Noninflammatory Fluid Accumulations.- Hydropericardium.- Hemopericardium.- Inflammation.- Pericarditis.- Miscellaneous Lesions.- Hemorrhage.- Mineralization.- Urate Deposits.- Pericardial Neoplasms.- Myocardium.- Inflammation.- Myocarditis.- Degenerative Lesions.- Fatty Change.- Lipofuscinosis.- Mineralization.- Myocardial Necrosis and Fibrosis.- Myocardial Lesions in Muscular Dystrophy.- Myocardial Infarction.- Miscellaneous Conditions.- Rhabdomyomatosis.- Round Heart Disease of Chickens and Turkeys.- Neoplasms.- Endocardium.- Inflammation.- Endocarditis.- Miscellaneous Conditions.- Depositions.- Valvular Telangiectasis.- Atrial Thrombosis.- Endocardiosis.- Endocardial Disease in the Rat.- Congenital Malformations.- Pericardial Defects.- Patent Ductus Arteriosus.- Persistent Right Aortic Arch.- Aortic Stenosis.- Pulmonic Stenosis.- Tetralogy of Fallot.- Septal Defects.- Endocardial Fibroelastosis.- Congestive Heart Failure.- Left-Sided Heart Failure.- Right-Sided Heart Failure.- Arteries.- Degenerative Arteriopathies.- Atherosclerosis.- Hypertension and Arteriosclerosis.- Mineralization (Calcification).- Aneurysm and Rupture.- Amyloidosis.- Nutritional and Metabolic Arteriopathies.- Toxic Arteriopathies.- Lead Poisoning.- Mercurial Poisoning.- Proliferative Arteriopathies.- Arteritis.- Polyarteritis (Panarteritis, Periarteritis).- Arterial Lesions in Hypersensitivity Syndromes.- Parasitic Diseases of Arteries.- Filariasis.- Spirocercosis.- Medial Hyperplasia of Feline Pulmonary Arteries.- Angiostrongylosis.- Protozoan Arterial Infections.- Other Arterial Parasitisms.- Thromboembolic Arteriopathies.- Vascular Neoplasms.- Veins.- Phlebitis and Thrombophlebitis.- Phlebothrombosis.- Lymphatics.- References.- 2 The Respiratory System.- Normal Anatomy, Histology, and Ultrastructure.- Gross Anatomy.- Preservation and Fixation of Pulmonary Tissue.- Microscopic Anatomy.- Ultrastructure.- Viral Diseases.- Giant Cell Pneumonia (Measles) in Primates.- Canine Distemper.- Poxviruses.- Adenoviruses.- Herpesviruses.- Feline Viral Rhinotracheitis.- Canine Herpesvirus.- Herpes simiae, Herpes tamarinus and Herpes Infections of Primates.- Cytomegalovirus.- Feline Picornavirus.- Reovirus Infection.- Feline Pneumonitis.- Pneumonia Virus of Mice.- Sendai Virus Infection.- K Virus of Mice.- Rat Coronavirus.- Mycoplasma Diseases.- Murine Chronic Respiratory Disease—Mycoplasma pulmonis.- Mycoplasma Infections of the Respiratory System of Other Species.- Bacterial Diseases and Agents.- Tuberculosis.- Pneumococcal Infection.- Klebsiella pneumoniae.- Pasteurella multocida.- Pasteurella pneumotropica.- Yersinia pseudotuberculosis.- Corynebacterium kutscheri.- Staphylococcus Species.- Melioidosis.- Bordetella bronchiseptica.- Mycobacterium lepraemurium.- Streptobacillus moniliformis.- Mycotic Diseases.- Geotrichum candidum in the Dog.- Protozoan Diseases.- Pneumocystosis.- Toxoplasmosis.- Miscellaneous Disorders of the Respiratory System.- Pneumoconiosis and Aspiration of Foreign Material.- Kaolinite Aspiration and Granulomas in Primates.- Amyloidosis.- Lipid Pneumonia.- Fat Embolism.- Pulmonary Edema.- Histiocytosis.- Hemothorax.- Pulmonary Arterial Hypertrophy and Hyperplasia.- Parasites.- Cestodes.- Trematodes.- Nematodes.- Aelurostrongylus abstrusus.- Filaroides milksi.- Filaroides osleri.- Filaroides gordius.- Angiostrongylus cantonensis.- Crenosoma vulpis.- Gongylonema spices.- Capillaria aerophila.- Anatrichosoma cutaneum and Anatrichosoma cynamolgi.- Pentastomes.- Linguatula serrata.- Arthropods.- Annelida.- Neoplasms.- Pulmonary Adenomatosis.- Primary Neoplasms of the Respiratory System.- Metastatic Neoplasms of the Respiratory System.- References.- 3 The Urinary System.- Glomerulonephritis.- Mice.- New Zealand Black (NZB) Mice.- Mice Infected with Lymphocytic Choriomeningitis Virus.- RF Mice.- NH Mice.- Mice Infected with Murine Tumor Viruses.- Rats and Mastomys.- Guinea Pigs.- Aleutian Disease of Mink.- Nonhuman Primates.- Cats.- Dogs.- Reptiles.- Chickens.- Interstitial Nephritis.- Focal Interstitial Nephritis.- Diffuse Interstitial Nephritis.- Acute and Subacute.- Chronic.- Canine.- Feline.- Suppurative Nephritis and Pyelonephritis.- Acute and Subacute.- Chronic.- Parasitic Nephritis.- Nonhuman Primates.- Dogs.- Mice, Rats, and Guinea Pigs.- Rabbits.- Progressive Renal Disease in Rats (Glomerulonephrosis).- Nephropathy in Mice.- Nephrosis.- Renal Amyloidosis.- Nonhuman Primates.- Mice.- Hamsters.- Dogs.- Cats.- Vascular Lesions.- Renal Infarcts.- Bilateral Cortical Necrosis.- Papillary Necrosis.- Renal Calcification (Mineralization).- Nonviral Cellular Inclusions in the Urinary Tract.- Pigment Deposition in the Urinary Tract.- Urolithiasis.- Cystitis.- Congenital Malformations.- Renal Agenesis and Aplasia.- Renal Hypoplasia.- Renal Fusion.- Glomerular Dysplasia.- Kidney Disease of Mice and Familial Renal Disease of Norwegian Elkhounds.- Polycystic Kidney Disease.- Hydronephrosis.- Ectopic Ureter.- Congenital Ureteral Valves.- Uremia.- References.- 4 The Digestive System.- Oral Cavity.- Salivary Glands.- Esophagus.- Stomach.- Small Intestine.- Large Intestine.- Liver.- Biliary System.- Avian Bursa Fabricius.- Pancreas.- Abdominal Cavity and Peritoneum.- References.- 5 The Nervous System.- Viral Infections.- Canine Herpesvirus Encephalitis.- Herpesvirus Encephalitis in Nonhuman Primates.- Encephalitis due to Herpes simplex (Herpesvirus hominis).- Herpes B (B virus, Herpesvirus simiae).- Herpesvirus T (Herpesvirus tamarinus, Herpesvirus M).- Marek’s Disease.- Rat Virus Encephalitis.- Cerebellar Hypoplasia Due to Feline Panleukopenia Virus.- Encephalitis Due to Reovirus III.- Canine Distemper.- Old Dog Encephalitis.- Newcastle Disease in Chickens.- Rabies.- Mouse Encephalomyelitis (Poliomyelitis in the Mouse, Theiler’s Encephalomyelitis Virus Infection).- MHG Virus Encephalomyelitis in Rats.- Poliomyelitis in Nonhuman Primates.- Avian Encephalomyelitis.- Type C RNA Virus Myelitis in Mice.- Encephalitis due to Murine Hepatitus Virus (MHV) (Hepatoencephalitis Group).- Lymphocytic Choriomeningitis.- Mycoplasmal, Bacterial, and Fungal Infections.- Rolling Disease of Mice and Rats—Mycoplasma neurolyticum Infection.- Purulent Meningitis and Brain Abscesses.- Tuberculosis.- Cryptococcosis.- Parasitic Infections.- Encephalitozoonosis (Nosematosis, Microsporidiosis).- Toxoplasmosis.- Helminth and Insect Infections of the Central Nervous System.- Neoplasms.- Nutritional, Demyelinating, Toxic, Metabolic, and Degenerative Diseases.- Thiamine Deficiency in the Cat.- Coonhound Paralysis (Idiopathic Polyradiculitis).- Lead Poisoning.- Lipid Storage Diseases (Lipidoses).- Age-Related Changes in the Nervous System.- Selected Neurologic Mutations in Mice.- References.- 6 The Endocrine System.- Pituitary.- Developmental Anomalies of the Pituitary.- Pharyngeal Hypophysis.- Cysts of the Craniopharyngeal Duct.- Cystic Dilation of the Residual Hypophyseal Lumen of Rathke’s Cleft.- Aplasia or Hypoplasia of the Pituitary.- Atrophic Changes in the Pituitary.- Inflammatory and Infectious Diseases of the Pituitary.- Hypertrophy and Hyperplasia of the Pituitary.- Benign and Malignant Tumors of the Pituitary.- Hypothalamic-Pituitary Axis Dysfunction.- Dwarfism, Cretinism, and Dwarf-cretinism in Rabbits.- Hypothalamic Diabetes Insipidus.- Cushing-like Syndrome and Disease.- Caudal Neurosecretory System in Fish.- Adrenal.- Developmental Disturbances.- Hypertrophy, Hyperplasia, and Neoplasia of the Adrenal.- Degenerative and Inflammatory Changes of the Adrenal.- Hypoadrenocorticism.- Hyperfunction of the Adrenal.- Thyroid.- Developmental Anomalies of the Thyroid Gland.- Aplasia and Hypoplasia.- Ectopic Thyroid Tissue.- Persistent Thyroglossal Duct.- Degenerative Changes of the Thyroid.- Atrophy.- Miscellaneous.- Autoimmune Thyroiditis.- Hypertrophy and