An 82-year-old woman was presented with a 6-month history of left flank pain and recurrent urinary infections who was pyrexial on admission. There was a palpable, slightly tender mass in the left hypochondrium. Her abdominal CT scan report is attached.

What diagnosis can be inferred from the reports? What initial management steps should be taken for this patient? *This case is posted from Docplexus Editorial Team for educative purpose only