One type of blood cancer that seems to cause a lot of confusion has two names. For more than twenty years what was once thought to be two different diseases has been considered as one. And to make matters worse this disease is both a leukemia and a type of non Hodgkins lymphoma (NHL). No wonder it gets confusing! Some people even think the doctor told them they have four different diseases (Leukemia, Lymphoma, CLL and SLL).