Background. Bladder diverticulum may be congenital and acquired. Iatrogenic bladder diverticulum is classified in a special group. Indications for surgery are: persistent or recurrent urinary infection, the presence of a stone in a diverticulum, development of tumor in a diverticulum cavity, the lower urinary tract symptoms and voiding symptoms and vesicoureteral reflux due to diverticulum or ureteral obstruction. Case report. We presented a patient with a giant bladder diverticulum. Transurethral bladder catheterisation was performed because of urine retention. Secondly, transurethral prostate resection solved subvesical obstruction. The third step was open, extravesical diverticulectomy. Post-operative course was without complications. Three months after the surgery, control intravenous urography revealed normal findings. Conclusion. We believe that the three-steps treatment of a giant bladder diverticulum significatntly contributed to the decreasing of postoperative complications. .