Leukemic myelomatosis (plasma cell leukemia).

Six cases of leukemic myelomatosis (plasma cell leukemia), are reported. A spectrum of leukemic plasmacellular proliferation was observed in this group: in two cases the plasmacytic leukemia was a terminal event of multiple myeloma, in one of a chronic lymphocytic leukemia, and in the remaining three cases the peripheral blood plasmacytosis was a presenting manifestation of an acute immunocytic dyscrasia. The clinical features, frequencies of extraosseous plasmacytic infiltrations, hypercalcemia and Bence Jones proteinuria, and cytomorphologic difficulties in differentiating plasmacytic from chronic lymphocytic leukemia are discussed.