Flaming promyelocytes in acute hypergranular promyelocytic leukaemia. Light and electron microscopic study

Flaming in the peripheral parts of promyelocytes was seen in 3 out of 4 patients with acute hypergranular promyelocytic leukaemia. In one of these patients (ER) the flaming was quite marked, and electron microscopy showed the flaming to correspond to greatly dilated cisternae of the RER.