Exfoliated 'myeloma cells' in the urine of a case of multiple myelomatosis.

The clinical features and special investigations in a case of multiple myelomatosis are described. The finding of exfoliated ;myeloma cells' in the urine of this case is thought to be unique, these cells closely resembling the myeloma cells seen in the bone marrow. The necropsy findings indicated that the origin of the cells was from a plasma cell infiltrate of the kidneys rather than from isolated plasmacytoma of any part of the urinary tract.