A case of RS may have arisen by one of two different routes: a<unk>  of the CLL cells into lymphoma, or the appearance of an unrelated lymphoma. It is thought that genetic defects may introduce the additional abnormalities necessary to transform CLL cells into<unk> 's syndrome cells.
Richter's transformation
Lupus nephritis
Shunt nephritis
Phosphate nephropathy
Benign nephrosclerosis
Analgesic nephropathy
IgA nephropathy
Myeloma cast nephropathy