Outcome and follow-up:
On follow-up, the patient developed resistant urinary tract infection two-weeks after discharge, for which she was hospitalized and treated with intravenous meropenem. She also received daily nitrofurantoin as maintenance therapy for several months and continued to be followed by an oncologist with interval imaging. At three months post-surgery, renal sonography showed a simple cyst with a diameter of 19 mm and an echogenic mass lesion measuring 20*28 mm in the lower bridge and sinus of the right kidney (respectively) as well as mild hydronephrosis. Moreover, lab tests demonstrated normocytic anemia, elevated creatinine, and hematuria. Three months after the operation, at the oncologist’s discretion, an FDG PET/CT scan (Discovery 690 VCT 64 Slicer, General Electric, USA) was performed for the patient that showed a hypermetabolic mass in the right kidney involving the pelvicalyceal system (SUVmax: 13.3) and the cortex (SUVmax: 6.3). Normal FDG activity was seen in the axial skeleton (Figure 3). As to the time of writing this report, the patient is alive and in good general condition. She is being monitored with imaging and is receiving oral prednisolone (5 mg/ twice daily), as prescribed by her oncologist. The right renal mass lesion has gradually decreased in size on follow-up imaging studies.