The adrenal gland will typically be in its normal location, but instead of an inverted Y shape, it will be more linear in shape. Sometimes that's described as a "pancake" or "lying-down" adrenal.
When there is hydronephrosis and increased pressure in the collecting system, the renal fornix may rupture. The hydronephrosis decreases as the fluid in the collecting system escapes from through the ruptured fornix into the perinephric space. Hope that helps!
Fetal lobulation will have normal cortical thickness, even underlying the site of cortical indentation. Scarring with leave a thin cortex, sometimes reaching the medullary pyramid, and will usually be more irregular and less uniform.
On the corticomedullary phase, the cortex brightly enhances, but the medullary pyramids remain dark. If there is a small renal lesion in the region of a medullary pyramid, it is less conspicuous on this phase compared to the later nephrographic phase at which point the renal parenchyma diffusely enhances.
