A 24yo man presents with painless hematuria. No other complaint  and no abnormality is found on physical exam. What is the most  appropriate initial inv which is helpful to get a dx?
a. Coag screening
b. MSU
c. Cystoscopy
d. MRI spine 
e. Abdominal US
Answer: E 
Cancer is unlikely at this age, no signs of infection or generalized bleeding tendency. PKD is highly suspected.