DR KLEPP
Yes, this is another feature which one gets when a person is in a condition of shock or low blood pressure, like the sub-endocardial haemorrhage that I mentioned.  The kidney has an auto-regulatory mechanism whereby instead of sending blood to the periphery of the kidney, it has a short-circuit and sends it back to the medulla.  So congestion of the medulla and streaking of the cortex is yet another sign in the deceased that he did not die immediately, but was in a state of shock.