1st April 2022

A 55-year-old man presents to A&E with sharp, severe pain in the right flank, nausea and vomiting

A 55-year-old man presents to A&E with sharp, severe pain in the right flank, nausea and vomiting for the past 5 hours. He has a past medical history of gout, renal stones, and hypertension. He had tried to ride out the pain, but his wife rang for an ambulance when he started to experience fever and chills. On examination, he is pyrexial and tachycardic. His urine dip is positive for microscopic haematuria, leukocytes and nitrites.

What complication of renal stones is he experiencing?

Select the SINGLE most appropriate diagnosis from the list below. Select ONE option only.