The following coronal CT scan image is from a 30 year old woman whose presenting problem has been severe right sided loin to groin pain. What can you see?[peekaboo_link name=”Answer”]Answer[/peekaboo_link] [peekaboo_content name=”Answer”]
The CT slice shows a calculus in the urethra, about 6 mm in size when measured. Other slices showed mild right sided hydronephrosis with perinephric stranding, indicating the passage of a right ureteric stone that is now in the urethra.
The patient uneventfully passed the stone after a few hours.
Urethral calculi are rare and can be of 2 types:
- Primary calculi that form secondary to the urethral stricture or diverticulum. They are predominantly made up of phosphate that is formed in infected urine.
- Secondary calculi originate elsewhere in the urinary tract and migrate to the urethra. They mostly contain calcium oxalate.