Urolithiasis can also be associated with hydronephrosis if there is a component of obstruction; however, the differential diagnosis of hydronephrosis in the pregnant patient is confounded by ph ysiologic hy dronephrosis o f pregnancy, which is thought to be caused by compression of the ureters between the gravid uterus and the linea terminalis [46]. Physiologic hydronephrosis of pregnancy occurs in >80% of pregnant patients, more commonly occurs on the right than the left, and is generally seen beginning in the second trimester [46]. CT Abdomen and Pelvis With IV Contrast There is no relevant literature documenting the additional benefit of CT abdomen and pelvis with IV contrast, relative to noncontrast CT, in the pregnant patient for the evaluation of stones. CT Abdomen and Pelvis Without and With IV Contrast There is no relevant literature documenting the additional benefit of CT abdomen and pelvis without and with IV contrast, relative to noncontrast CT alone, in the pregnant patient for the evaluation of stones. Acute Onset Flank Pain-Suspicion of Stone Disease CT Abdomen and Pelvis Without IV Contrast CT abdomen and pelvis without IV contrast has been shown to be a sensitive and specific test for diagnosing stones in pregnant patients [47]. The key consideration in CT studies for pregnant patients with suspected urolithiasis is mitigating effects of radiation dose by optimizing dose in each study and reducing the overall number of imaging studies to the lowest number possible. CTU Without and With IV Contrast There is no relevant literature documenting the additional benefit of CTU without and with IV contrast, relative to noncontrast CT alone, in the pregnant patient for the evaluation of stones.
Acute Onset Flank Pain Suspicion of Stone Disease Urolithiasis . Urolithiasis can also be associated with hydronephrosis if there is a component of obstruction; however, the differential diagnosis of hydronephrosis in the pregnant patient is confounded by ph ysiologic hy dronephrosis o f pregnancy, which is thought to be caused by compression of the ureters between the gravid uterus and the linea terminalis [46]. Physiologic hydronephrosis of pregnancy occurs in >80% of pregnant patients, more commonly occurs on the right than the left, and is generally seen beginning in the second trimester [46]. CT Abdomen and Pelvis With IV Contrast There is no relevant literature documenting the additional benefit of CT abdomen and pelvis with IV contrast, relative to noncontrast CT, in the pregnant patient for the evaluation of stones. CT Abdomen and Pelvis Without and With IV Contrast There is no relevant literature documenting the additional benefit of CT abdomen and pelvis without and with IV contrast, relative to noncontrast CT alone, in the pregnant patient for the evaluation of stones. Acute Onset Flank Pain-Suspicion of Stone Disease CT Abdomen and Pelvis Without IV Contrast CT abdomen and pelvis without IV contrast has been shown to be a sensitive and specific test for diagnosing stones in pregnant patients [47]. The key consideration in CT studies for pregnant patients with suspected urolithiasis is mitigating effects of radiation dose by optimizing dose in each study and reducing the overall number of imaging studies to the lowest number possible. CTU Without and With IV Contrast There is no relevant literature documenting the additional benefit of CTU without and with IV contrast, relative to noncontrast CT alone, in the pregnant patient for the evaluation of stones.