Repetitive urinary tract infections and two prostatic masses: Prostatic soft tissue infection with Actinomyces neuii.

Actinomyces infection is a tissue destructive, low-grade infection that often resembles malignancy. We report the case of a 70-year-old male with repeated, culture-negative urinary tract infections while intermittently catheterized. At presentation, the patient reported a new episode of urinary tract infection with white discharge in his urine. Transrectal ultrasonography showed two lesions in the prostate, suspect for prostate cancer. However, biopsy did not show cancer, and anaerobic culture grew Actinomyces neuii. A 3-month antibiotic course of amoxicillin eventually cured the infection. This is a case of prostatic soft tissue infection with A. neuii. It is important to consider Actinomyces infection in patients with a non-malignant prostatic mass. Although β-lactam antibiotics do not penetrate the prostate well, the Actinomyces infection was cured by prolonged amoxicillin treatment in this case. It is possible that the tissue damage enhanced the amoxicillin concentration in the infected prostate.