Contrast-Enhanced Abdominal-Pelvic CT Scanning in Patients with Renal Impairment

Introduction to Renal Risk Assessment

The American College of Radiology recommends that the decision to perform a contrast-enhanced abdominal-pelvic CT scan in patients with renal impairment should be based on the estimated glomerular filtration rate (GFR) and the risk-benefit ratio, with a preference for non-contrast CT scans when possible for diagnostic evaluation 1, 2

The American College of Radiology suggests that non-contrast abdominal-pelvic CT scans are diagnostically effective for multiple conditions, including intestinal obstruction, urinary calculi, hydronephrosis, and retroperitoneal pathology, and should be the first choice in patients with renal impairment 1, 2, 3
Non-contrast CT scans can effectively identify intestinal dilation, transition points, wall thickening, and complications such as perforation or ischemia in patients with intestinal obstruction 4
The American College of Radiology recommends non-contrast CT scans as the most sensitive modality for detecting urinary calculi 1, 3, 5

The American College of Radiology suggests that contrast-enhanced CT scans may be considered in specific situations where diagnostic information is essential and cannot be obtained otherwise, such as in cases of suspected mesenteric ischemia, vascular thrombosis or stenosis, and pelvic masses 2, 5, 6
In these cases, the minimum necessary dose of contrast should be used, and adequate volume expansion should be ensured 2, 3

When contrast-enhanced CT scans are contraindicated, alternative diagnostic approaches such as non-contrast MRI, non-contrast MR angiography, and Doppler ultrasound may be considered 1, 3, 5
Non-contrast MRI can be used to characterize obstruction or morphological renal anomalies, with a sensitivity of 73-100% for detecting renal artery stenosis >50% 1, 3, 5
Doppler ultrasound has a sensitivity of 85% and specificity of 84% for detecting stenosis >60% 1, 5