Radiology Which of the following is not seen on ultrasound in acute pyelonephritis? A Grossly enlarged kidney B Focal area of hypoechogenecity C Perinephric collection (pus in the perinephric space) D Increased vascularity 💡 Explanation Which of the following is not seen on ultrasound in acute pyelonephritis? ✓ Correct Answer: D. Increased vascularity