Histiocytic sarcoma of macrophage origin in a cat: case report with a literature review of feline histiocytic malignancies and comparison with canine hemophagocytic histiocytic sarcoma. 2008

Kristen R Friedrichs, and Karen M Young
Department of Pathobiological Sciences, University of Wisconsin School of Veterinary Medicine, 2015 Linden Drive, Madison, WI 53706, USA. friedrik@svm.vetmed.wisc.edu

Mild nonregenerative anemia was detected in a 9-year-old neutered male domestic shorthair cat during a routine examination. Bone marrow core biopsy revealed erythroid hyperplasia; however, a specific cause was not identified. Over the next 8 months the anemia progressed, eventually becoming mildly regenerative, and moderate thrombocytopenia developed. On ultrasonographic examination, marked splenomegaly, mild hepatomegaly, and abdominal lymphadenopathy were found. Cytologic evaluation of splenic aspirates revealed increased numbers of mildly to moderately pleomorphic histiocytes that frequently had phagocytosed RBCs, leukocytes, and occasionally platelets. Histopathologic examination of the spleen and liver revealed effacement of splenic architecture by a histiocytic sarcoma (HS), and neoplastic histiocytes in hepatic sinusoids. A second bone marrow aspirate revealed neoplastic infiltration by similar cells. The histiocytes in all tissues were mildly to moderately pleomorphic and markedly erythrophagocytic. The immunophenotype of histiocytes in the spleen was CD1c(-)/CD11b(+)/CD18(+)/MHC-II(+), supporting a macrophage cell lineage. The clinical, pathologic, and immunophenotypic findings in this cat were similar to those in hemophagocytic HSs in dogs. To our knowledge, this is the first report of a HS of purported macrophage phenotype in a cat.

UI MeSH Term Description Entries
D008264 Macrophages The relatively long-lived phagocytic cell of mammalian tissues that are derived from blood MONOCYTES. Main types are PERITONEAL MACROPHAGES; ALVEOLAR MACROPHAGES; HISTIOCYTES; KUPFFER CELLS of the liver; and OSTEOCLASTS. They may further differentiate within chronic inflammatory lesions to EPITHELIOID CELLS or may fuse to form FOREIGN BODY GIANT CELLS or LANGHANS GIANT CELLS. (from The Dictionary of Cell Biology, Lackie and Dow, 3rd ed.) Bone Marrow-Derived Macrophages,Monocyte-Derived Macrophages,Macrophage,Macrophages, Monocyte-Derived,Bone Marrow Derived Macrophages,Bone Marrow-Derived Macrophage,Macrophage, Bone Marrow-Derived,Macrophage, Monocyte-Derived,Macrophages, Bone Marrow-Derived,Macrophages, Monocyte Derived,Monocyte Derived Macrophages,Monocyte-Derived Macrophage
D008297 Male Males
D002371 Cat Diseases Diseases of the domestic cat (Felis catus or F. domesticus). This term does not include diseases of the so-called big cats such as CHEETAHS; LIONS; tigers, cougars, panthers, leopards, and other Felidae for which the heading CARNIVORA is used. Feline Diseases,Cat Disease,Disease, Cat,Disease, Feline,Diseases, Cat,Diseases, Feline,Feline Disease
D002415 Cats The domestic cat, Felis catus, of the carnivore family FELIDAE, comprising over 30 different breeds. The domestic cat is descended primarily from the wild cat of Africa and extreme southwestern Asia. Though probably present in towns in Palestine as long ago as 7000 years, actual domestication occurred in Egypt about 4000 years ago. (From Walker's Mammals of the World, 6th ed, p801) Felis catus,Felis domesticus,Domestic Cats,Felis domestica,Felis sylvestris catus,Cat,Cat, Domestic,Cats, Domestic,Domestic Cat
D004283 Dog Diseases Diseases of the domestic dog (Canis familiaris). This term does not include diseases of wild dogs, WOLVES; FOXES; and other Canidae for which the heading CARNIVORA is used. Canine Diseases,Canine Disease,Disease, Canine,Disease, Dog,Diseases, Canine,Diseases, Dog,Dog Disease
D004285 Dogs The domestic dog, Canis familiaris, comprising about 400 breeds, of the carnivore family CANIDAE. They are worldwide in distribution and live in association with people. (Walker's Mammals of the World, 5th ed, p1065) Canis familiaris,Dog
D000818 Animals Unicellular or multicellular, heterotrophic organisms, that have sensation and the power of voluntary movement. Under the older five kingdom paradigm, Animalia was one of the kingdoms. Under the modern three domain model, Animalia represents one of the many groups in the domain EUKARYOTA. Animal,Metazoa,Animalia
D051359 Lymphohistiocytosis, Hemophagocytic A group of related disorders characterized by LYMPHOCYTOSIS; HISTIOCYTOSIS; and hemophagocytosis. The two major forms are familial and reactive. Familial Hemophagocytic Lymphocytosis,Hemophagocytic Lymphohistiocytosis, Familial,Hemophagocytic Syndrome, Infection-Associated,Hemophagocytic Syndrome, Reactive,Hemophagocytic Syndromes,Reactive Hemophagocytic Syndrome,Erythrophagocytic Lymphohistiocytosis, Familial,Familial Erythrophagocytic Lymphohistiocytosis,Familial Hemophagocytic Histiocytosis,Familial Hemophagocytic Lymphohistiocytosis,Familial Hemophagocytic Reticulosis,Familial Histiocytic Reticulosis,Hemophagocytic Lymphohistiocytosis Familial -1,Hemophagocytic Lymphohistiocytosis, Familial, 1,Hemophagocytic Reticulosis, Familial,Hemophagocytic Syndrome,Primary Hemophagocytic Hymphohistiocytosis,Primary Hemophagocytic Lymphohistiocytosis,Reticulosis, Familial Histiocytic,Erythrophagocytic Lymphohistiocytoses, Familial,Familial Erythrophagocytic Lymphohistiocytoses,Familial Hemophagocytic Histiocytoses,Familial Hemophagocytic Lymphocytoses,Familial Hemophagocytic Lymphohistiocytoses,Familial Hemophagocytic Reticuloses,Familial Histiocytic Reticuloses,Hemophagocytic Histiocytoses, Familial,Hemophagocytic Histiocytosis, Familial,Hemophagocytic Hymphohistiocytoses, Primary,Hemophagocytic Hymphohistiocytosis, Primary,Hemophagocytic Lymphocytoses, Familial,Hemophagocytic Lymphocytosis, Familial,Hemophagocytic Lymphohistiocytoses,Hemophagocytic Lymphohistiocytoses, Familial,Hemophagocytic Lymphohistiocytoses, Primary,Hemophagocytic Lymphohistiocytosis,Hemophagocytic Lymphohistiocytosis Familial 1,Hemophagocytic Lymphohistiocytosis, Primary,Hemophagocytic Reticuloses, Familial,Hemophagocytic Syndrome, Infection Associated,Histiocytic Reticuloses, Familial,Histiocytic Reticulosis, Familial,Histiocytoses, Familial Hemophagocytic,Histiocytosis, Familial Hemophagocytic,Hymphohistiocytoses, Primary Hemophagocytic,Hymphohistiocytosis, Primary Hemophagocytic,Infection-Associated Hemophagocytic Syndrome,Lymphocytoses, Familial Hemophagocytic,Lymphocytosis, Familial Hemophagocytic,Lymphohistiocytoses, Familial Erythrophagocytic,Lymphohistiocytoses, Familial Hemophagocytic,Lymphohistiocytoses, Hemophagocytic,Lymphohistiocytoses, Primary Hemophagocytic,Lymphohistiocytosis, Familial Erythrophagocytic,Lymphohistiocytosis, Familial Hemophagocytic,Lymphohistiocytosis, Primary Hemophagocytic,Primary Hemophagocytic Hymphohistiocytoses,Primary Hemophagocytic Lymphohistiocytoses,Reticuloses, Familial Hemophagocytic,Reticuloses, Familial Histiocytic,Reticulosis, Familial Hemophagocytic
D054747 Histiocytic Sarcoma Malignant neoplasms composed of MACROPHAGES or DENDRITIC CELLS. Most histiocytic sarcomas present as localized tumor masses without a leukemic phase. Though the biological behavior of these neoplasms resemble lymphomas, their cell lineage is histiocytic not lymphoid. Histiocytosis, Malignant,Malignant Histiocytosis,True Histiocytic Lymphoma,True Malignant Histiocytosis,Histiocytic Lymphoma, True,Histiocytic Lymphomas, True,Histiocytic Sarcomas,Histiocytoses, Malignant,Histiocytoses, True Malignant,Histiocytosis, True Malignant,Lymphoma, True Histiocytic,Lymphomas, True Histiocytic,Malignant Histiocytoses,Malignant Histiocytoses, True,Malignant Histiocytosis, True,Sarcoma, Histiocytic,Sarcomas, Histiocytic,True Histiocytic Lymphomas,True Malignant Histiocytoses

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