title: Extramedullary hematopoietic proliferations, extraosseous plasmacytomas, and ectopic splenic implants (splenosis).
abstract: Hematopoietic proliferations are well known to present ectopically outside the bone marrow, either in benign or malignant form. As such, they present a distinct problem with respect to morphologic interpretation because of their uncommonality in extramedullary sites and their capacity to simulate other lesions histologically. This review considers extramedullary myeloid tumors ("granulocytic sarcoma," "erythroblastic sarcoma," "megakaryocytic sarcoma"), tumefactive extramedullary hematopoiesis, and the peculiar condition known as "splenosis," with consideration of their clinical, microscopic, and cytohistochemical chararacteristics.
authors.affiliation: Division of Anatomic Pathology, Histopathology, & Diagnostic Cytopathology, Department of Laboratory Medicine & Pathology, A. Cardarelli Hospital, Naples, Italy.
authors.forename: Oscar
authors.initials: O
authors.lastname: Nappi
authors.forename: Amedeo
authors.initials: A
authors.lastname: Boscaino
authors.forename: Mark R
authors.initials: MR
authors.lastname: Wick
mesh_terms: D014408:Biomarkers, Tumor / Q000378:metabolism; D003937:Diagnosis, Differential; D006411:Hematopoiesis, Extramedullary; D006801:Humans; D010954:Plasmacytoma / Q000378:metabolism / Q000473:pathology*; D023981:Sarcoma, Myeloid / Q000378:metabolism / Q000473:pathology*; D013154:Spleen / Q000378:metabolism / Q000473:pathology*; D017890:Splenosis / Q000378:metabolism / Q000473:pathology*
chemical_list: D014408:Biomarkers, Tumor