imaging of Urinary tract obstruction

Question Number 1477

in the imaging of Urinary tract obstruction in children

a) Radioisotopic renography using technetium labeled diethylenetriaminepenta-acetic acid (DTPA) gives an accurate esttimaate of renal function
b) in the presence of ureteral dilatation the main indication of Voiding Cystourethrography is to outrule the presence of ureteroceles
c) the Whitaker test is useful for assessing the upper collecting systems in equivocal cases
d) on intravenous urography initial concentration of the radiopaque medium on the obstructed side is decreased
e) When the urethra cannot be catheterized to obtain a voiding cystourethrogram the most likely aetiology is posterior urethral valves

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