An inadequate clinical examination failed to perceive a mild abdominal distention in the hypogastric region and a history of recent absence of urination. The patient was catheterized and obtained relief of symptoms. 

Acute urinary retention, as in this case, is usually managed clinically, without image evaluation. Immediate management requires bladder decompression with catheterization. 

Anatomical and functional disturbs listed as causes for acute urinary retention, such as infection, post-operative pain, and operative analgesia or anesthetic (e.g. epidural).