A 56-year-old woman with cervical cancer treated previously with radio- and brachytherapy, and receiving palliative chemotherapy, with a right-sided nephrostomy, was admitted to the hospital with a suspected recurrence of a right kidney abscess. Diagnostic imaging has revealed a duodenocaval fistula (DCF) with an inflammatory reaction entraining the right ureter along with thrombosis of the inferior vena cava (IVC) and the left common iliac vein. Given the high perceived risk of surgical complications, the patient was treated conservatively and was discharged from the hospital in stable condition 5 weeks after admission.