Normal Morphologic and Immunohistochemical Findings and Hyperplasias.- Anatomy and Normal Histology.- Hyperplasias.- Normal Immunohistochemistry.- Congenital Malformations and Abnormalities of Spleen Location and Histology.- Accessory Spleen.- Intrapancreatic Spleen.- Polysplenia.- Splenosis.- Splenogonadal Fusion.- Other Findings.- Lymphoid Neoplasms.- Splenic Marginal Zone Lymphoma.- Chronic Lymphocytic Leukemia.- Lymphoplasmacytic Lymphoma.- Follicular Lymphoma.- Mantle Cell Lymphoma.- Plasma Cell Myeloma.- Hairy Cell Leukemia-Variant.- Splenic Diffuse Red Pulp Small B-Cell Lymphoma.- Prolymphocytic Leukemia.- Lymphoblastic Leukemia/Lymphoma.- Hepatosplenic T-cell Lymphoma.- T-cell Large Granular Lymphocytic Leukemia.- Other T-cell Lymphomas.- Diffuse Large B-cell Lymphomas.- Hodgkin Lymphoma.- Myeloid and Related Disorders.- Extramedullary Hematopoiesis.- Myeloid Sarcoma/Acute Myeloid Leukemia.- Myeloproliferative Neoplasms.- Myelodysplastic Syndrome and Myelodysplastic/Myeloproliferative Disorders.- Mastocytosis.- Histiocytic Sarcoma.- Nonhematopoietic Lesions Including Vascular.- Cysts.- Hamartoma.- Inflammatory Pseudotumor.- Follicular Dendritic Cell Tumor.- Other Stromal Tumors.- Splenic Artery Aneurysm.- Benign Vascular Lesions.- Littoral Cell Angioma.- Sclerosing Angiomatoid Nodular Transformation (SANT).- Vascular Tumors of Indeterminate and Malignant Behavior.- Metastatic Tumors.- Reactive and Systemic Conditions.- Rupture and Trauma.- Infarction and Embolization.- Perisplenitis (Sugar-Coated Spleen).- Congestive Splenomegaly.- Red Blood Cell Disorders.- Granulomas.- Langerhans Cell Histiocytosis.- Storage Diseases.- Castleman Disease.- Therapy Effects.- Other Disorders.- Hemophagocytic Syndrome.- Autoimmune Disorders.- Immunodeficiency (Inherited and Acquired).- Infections.- Bacterial.- Mycobacteria.- Viruses.- Fungi.- Parasites and Protozoa.