Over the period of last two decades, USG has come to be the mainstay in investigating urinary tract pathology. With the improvement in technology, resolution and variety of transducers, number of traditional IVP’s ordered have significantly reduced. Advantages of USG are its easy availability, flexibility, lack of ionizing radiation and lack of risk of a contrast reaction and facility of being done at bedside. Last but not the least the display of accurate anatomic information and sometimes physiological information (with colour flow imaging). A relative disadvantage of USG is that it is to some extent operator dependent and expertise of the operator can sometimes affect the diagnostic accuracy.