The prostatic abscess is a rare disease whose diagnosis has benefited from advances in imaging. Its treatment of choice remains trans-urethral endoscopic drainage. We report the case of a prostatic abscess in a 65-year-old patient who had had an obstructive syndrome of the lower urinary tract with dyschesis for 2 years. Ultrasound made the diagnosis by showing the presence of a prostatic abscess collection. The patient was placed under an antibiotic treatment, with transurethral drainage of the abscess. The evolution has been favorable.