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....