Renal colic is no more common in pregnancy. Pregnancy represents some special considerations.

Ultrasound remains the investigation of choice in this group of patients. Although the diagnosis can present problems as hydronephrosis of pregnancy can make diagnosis of associated obstructing calculus difficult.

Endovaginal images can help with visualisation in distal ureteric and ureterovesical stonesIf there is any diagnostic uncertainty and if the risks outweigh the benefits then unenhanced CT may be indicated in later pregnancy. 80% of calculi pass spontaneously, therefore favouring conservative management.