UKMLA PLAB AMC USMLE Prometric MCQ

a) pneumonia is most commonly due to pneumocystis carinii
b) a widened mediastinum may be secondary to steroid treatment
c) calyceal dilation usually signifies obstruction
d) high vascular impedance is most likely to be due to renal artery stenosis
e) MRI is useful in ruling out acute tubular necrosis in suspected rejection