Figure 10a. Segmental artery stenosis in an 82-year-old man with an elevated serum creatinine level. The patient had undergone transplantation 4 months earlier. MPVR (a) and volume-rendered (b) images demonstrate a segmental transplant renal artery stenosis (arrow). This finding was not believed to be clinically significant because the patient presented with renal dysfunction rather than hypertension.