Sonography of a case of bilateral fetal hydronephrosis

34 week fetus...bilateral fetal hydronephrosis.. the question is , is this pelviureteric junction obstruction or is it posterior urethral valves...
See ultrasound images below: are those two structures the fetal ureter/ hydroureter or are they bowel loops

The fetal bladder....is it a typical keyhole bladder:

Fetal rt. kidney and is that a right hydroureter?

A wee bit of polyhydramnios....

Renal calculus 3D ultrasound image

A 3D ultrasound image of left renal calculus. The calculus is seen in the upper part of the pelvis of left kidney. (Ultrasound image courtesy of Dr. Ravi Kadasne, MD, UAE).

for more on this topic visit: http://www.ultrasound-images.com/renal-calculi/
Also: http://cochinblogs.blogspot.in/2011/04/kidney-stones-renal-calculi-urinary.html