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[Primary splenic lymphoma complicated by malignant rheumatoid arthritis and bladder cancer].

A 64-year-old man had been found to have primary splenic lymphoma (stage III) seven years after the diagnosis of rheumatoid arthritis (RA). Histological diagnosis of the lymphoma was diffuse, medium sized cell type (LSG) or intermediate lymphocytic lymphoma (ILL). Splenectomy and ten courses of CHOP regimen produced continuing remission. After tow years, he suffered from peripheral neuropathy due to vasculitis of polyarteritis nodosa (PN) type. He was treated with prednisolone (PSL) and cyclophosphamide (CPM) for malignant rheumatoid arthritis. One year later, evaluation for intermittent hematuria revealed bladder cancer and he underwent total cystectomy. He has been treated with small doses of PSL under observation. The high incidence of ILL in lymphomas developing in patients with autoimmune diseases of the thyroid and salivary glands has been reported. This case suggests an association between antecedent RA and splenic lymphoma, the influence of splenectomy and chemotherapy on occurrence of rheumatoid vasculitis, and a causal relationship between CPM and bladder cancer.