[Lymphocytic aggregations in the bone marrow: their occurrence and morphologic analysis]

We analyzed the morphology and incidence of aggregations of mature lymphocytes of the bone marrow in the autopsy material of 425 cases excluding disorders of the hematopoietic and lymphatic systems. We found that lymphocytic aggregations occurred in 21.1% cases. There were two morphologic types of lymphocytic aggregations of the bone marrow, namely lymphoid follicles and infiltrates. It was shown that the incidence of lymphoid nodules of the bone marrow increased with age and that the structures were more frequent in women. We pointed to the significance of lymphocytic aggregations presence in the bone marrow in differentiating with malignant infiltrations of the lymphatic system involving the bone marrow.