[Gross haematuria as the primary symptom of extramedullary IgM plasmacytoma of the bladder].

Haematuria is the most common clinical symptom of bladder cancer. Besides antibiotic treatment of a probably existing urinary tract infection, ultrasonography of the urinary organs, diagnostic cystoscopy (with biopsy if needed), and radiologic evaluation of the upper urinary tract (intravenous urography, computed tomography or magnetic resonance urography, retrograde pyelography) should be done for further evaluation. Atypical manifestations of systemic diseases with bladder infiltration could feign the clinical appearance of chronic cystitis and hinder determination of the correct diagnosis. The case of a 40-year-old man with recurrent gross haematuria due to extremely rare bladder infiltration through an IgM plasmacytoma is presented.