Figure 2. Renal MR angiography without intravenous contrast material for evaluation of hypertension at 31 weeks gestation. Coronal three-dimensional phase-contrast MR angiogram obtained without intravenous contrast material shows the main renal arteries and multiple branches, thus allowing exclusion of renal artery stenosis. The acquisition time was 4 minutes 9 seconds. The patient gave birth prematurely 2 weeks later, and the hypertension resolved afterward.