A spontaneous hematopoietic neoplasm in a cotton-top marmoset (Saguinus oedipus) was characterized by perivascular infiltration and invasion of the liver, kidneys, adrenals, spleen, lymph nodes, bone marrow, and lungs by a pleomorphic primitive reticular cell. A significant fraction of the circulating white cells was of the same cell type. The disease was diagnosed as lymphosarcoma of the reticulum-cell type with features similar to viral-induced malignancy previously described.
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