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Dystrophic calcification (DC) can occur as a reaction to tissue damage and necrosis. So far, this has never been described as a complication after conventional transurethral resection of the prostate (TURP). We report on a 59-year-old man who underwent uncomplicated monopolar TURP for lower urinary tract symptoms caused by benign prostatic hyperplasia. The patient showed an excellent course up to 5 weeks after the initial operation. Afterward he suffered from a rapid onset of irritative and obstructive voiding symptoms and pain. Complete DC of the prostatic resection cavity was found by cystoscopy and recurred quickly twice after Re-TURP despite anti-inflammatory treatment and normal urinary and metabolic findings. Complete recovery was only achieved by gently scraping off the calcifications avoiding further trauma to the residual prostatic tissue. In rare cases, delayed occurrence of irritative and obstructive voiding symptoms after TURP can be caused by DC of the prostatic resection cavity and might be misinterpreted as post-TURP infection. The pathomechanism of DC and the presented case suggest minimizing tissue trauma by cautious removal of calcifications rather than performing extensive Re-TURP.