Image of the Week: Recurring abdominal and flank pain in a 37-year-old woman

A 37-year-old woman presents to her family clinician with recurring abdominal and flank pain. She mentions her mother had kidney problems, but she does not know many details. Examination reveals a blood pressure of 170/110 mm Hg, and proteinuria is present on dipstick. Laboratory tests show elevated hematocrit, microalbuminuria, and microscopic hematuria levels. A CT scan later reveals the findings ...