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IgA nephropathy and small cell lung carcinoma.

The occurrence of glomerular disease as a paraneoplastic manifestation of malignancy is well documented in the medical literature. The strongest association is between membranous glomerulonephritis and solid tumors. We report a patient with IgA nephropathy associated with small cell lung cancer. To our knowledge, this is the second documented occurrence of an IgA nephropathy with a casual association with small cell bronchogenic cancer. This observation leads to the hypothesis that IgA nephropathy might be a paraneoplastic manifestation of this histiologic type of lung cancer.