The Same Type of Crystalline Inclusions in T‐Lymphocytes as in Plasma Cells and B‐Lymphocytes in Multiple Myeloma A Pathological Clone Originating from a Common Lymphocyte Stem Cell?

2 patients with multiple myeloma had the same type of crystals in plasma cells, B-lympho-cytes, and T-lymphocytes. It is hypothesized that these crystals are formed in cells belonging to the same clone of pathological cells. The clone would then have to be derived from a common lymphocyte stem cell.