A Vesico-ureteric junction calculus:

Ultrasound image showing a large Vesico-ureteric junction calculus. Can the surrounding soft tissue swelling be due to mucosal oedema? Or is it a not-so-obvious ureterocele? My personal opinion is in favour of mucosal oedema. Image courtesy of Dr. Gunjan Puri, India.

A different sonographic approach to pick up ureteric calculi:

This is an ultrasound image of a distal ureteric calculus. What makes it so special is that it was diagnosed by transvaginal scan. Dr. Gunjan Puri, MD, Surat, India finds this approach, helps detect ureteric calculi which are difficult to pick up by transabdominal scan. Color doppler helps confirm the diagnosis with the typical twinkling sign.
You can see more such ultrasound images of the urinary tract at:http://drjoea.googlepages.com/urinarytract