Acute urinary retention secondary to perforated diverticulitis misdiagnosed as acute prostatitis.

Abdominal abscess resulting from a perforated diverticulitis has never been reported as a cause of acute urinary retention. Our patient is the first case to be reported. Because of the atypical presentation, he was initially misdiagnosed and treated as having acute prostatitis. Emergency physicians should have a high index of suspicion. Detailed history, abdominal sonography, and digital examination are helpful in diagnosing this disease.