CASE REPORTS
JOURNAL ARTICLE
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Cast nephropathy: an extremely rare renal presentation of Waldenström's macroglobulinaemia.

BMJ Case Reports 2015 October 8
Renal involvement in Waldenström's macroglobulinaemia (WM) is very unusual when compared to multiple myeloma. We report a case of a patient who developed anuric acute kidney injury secondary to cast nephropathy, dependent on high-flux haemodialysis. Complementary study revealed the presence of blood IgM monoclonal gammopathy and a massive bone marrow lymphoplasmacytic infiltration. There were no osteolytic lesions and no clinical signs/symptoms of hyperviscosity syndrome. The diagnosis of WM was established and a dexamethasone plus cyclophosphamide regime was started, in addition to plasmapheresis. The patient partially recovered renal function allowing haemodialysis and plasmapheresis withdrawal. He remained asymptomatic with a good response to chemotherapy and 12 months after his renal function remained stable. This is a rare clinical case in which WM presented as an IgM cast nephropathy, which in turn is an extremely rare renal presentation of this equally rare haematological disorder.

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