Diffuse Large B-Cell Lymphoma With Membranous Proliferative Glomerulonephritis as the First Manifestation: A Case Report.

Clinicians should investigate the causes of kidney disease in patients with poor therapeutic effects. Lymphoma should be considered in patients with renal damage combined with anemia, elevated globulin, elevated immunoglobulin, and lymphadenopathy. Promptly perform renal biopsy, lymph node biopsy, and blood and bone marrow specimen examination to avoid misdiagnosis and delayed treatment.