Persistent bilateral ureteral obstruction secondary to endometriosis despite treatment with an aromatase inhibitor

Objective: To present a case demonstrating lack of efficacy of an aromatase inhibitor in treating ureteral endometriosis. Design: Case report. Setting: A tertiary-care hospital. Patient(s): A 47-year-old woman with severe ureteral endometriosis. Intervention(s): Anastrozole 1 mg daily for 15 months. Main Outcome Measure(s): Renal function. Result(s): Despite medical management with anastrozole, our patient continued to have worsening renal function and subsequently required surgical intervention. Conclusion(s): Anastrozole was ineffective at preventing deterioration of renal function in this patient.