The diagnosis of urolithiasis is rarely made with ultrasound wherever CT is available, due to the relatively high sensitivity of the clinical presentation in directing investigation, and the high sensitivity of CT in confirming the diagnosis. 

In this case however ultrasound was performed, and showed very nicely the features, namely the obstructing calculus at the right vesicoureteric junction with Doppler color comet tail artifact, right hydronephrosis and absence of right ureteric jet.