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In ultrasonography of the renal tract, which of the following are true?
a) Pregnancy-related renal dilatation is present by the tenth week of gestation
b) In pregnancy-related dilatation of the collecting system, the right side is invoked in most cases
c) The resistive index (Rl) in intrarenal arteries is normally greater than 0.7
d) Renal cancers are rarely hyperechoic at ultrasound
e) A hyperechoic lesion with posterior acoustic shadowing in the absence of calcification on ultrasound is more suggestive of angiomyolipoma than renal cell carcinoma

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