Example of IgD-λ multiple myeloma diagnosed on the basis of large polynuclear macrophages detected in the urine

Abstract

The patient was a 40-year-old male who was admitted to our hospital because of pain in his left chest in 201X. He was diagnosed as having multiple myeloma from the results of bone marrow examination. There was no significant difference between the qualitative and quantitative urine test results when he was hospitalized. Large polynuclear macrophages and casts were observed during urine sediment examination, which suggested myeloma kidney due to multiple myeloma. Thus, there is a possibility of merging of myeloma kidney and it is important to detect this.