Blunt trauma to the abdomen – don’t forget the kidneys!

What is the incidence of haematuria (microscopic or macroscopic) associated with renal injury?

Which of the following investigation will provide rapid information about renal laceration?

The above patient is not shocked and there are no other major associated injuries.
The CT shows a right renal perinephric haematoma, which is classed as a low-grade injury (grade II).

Which of the following is correct management?