[A Case of Malacoplakia of the Prostate which was Difficult to Distinguish from Prostate Cancer].

A 70-year-old-man was referred with urination pain and pyuria. Prostate specific antigen was 10.6 ng/ml, and urine culture was Escherichia coli. The abdominal ultrasonography showed irregular low echo at the right lobe of prostate. Prostate magnetic resonance imaging (MRI) showed an extracapsular infiltrated prostate tumor in the right lobe. Levofloxacin was administered and prostate biopsy was performed. The pathological examination revealed that the prostate tissue was filled with inflammatory cells and had lost its glandular duct structure. The patient was diagnosed with malacoplakia of the prostate. Four months after prostate biopsy, prostate MRI imaging showed disappearance of the extracapsular infiltration in right peripheral zone.