MRI is the Investigation of choice for which of the following?: (A) Renal stones, (B) Renal aery stenosis, (C) High grade VUR, (D) Renal transplant rejection
Answer is B. Contrast-enhanced MRA is sufficiently sensitive to be used as a screening test for stenosis of the main renal aery. MRA has lower spatial resolution compared with conventional film-based angiography, and therefore the detection of small-vessel abnormalities, such as vasculitis and distal vasospasm, is problematic.