Introduction: Management of ureteral obstruction in the advanced abdominal or pelvic malignancy is challenging. Management of
such patients requires percutaneous nephrostomy tube (PCN) placement or indwelling ureteral double j (DJ) stent insertion for
drainage of the obstruction. Endoscopic DJ stent insertion is commonly done in lithotomy position but PCN placement in the prone
position. Change of patient's position is often required in the failure of one method of urine drainage. Management of ureteral
obstruction in Flank free oblique supine modified lithotomy position (fosml) position allows DJ stent placement in both retrograde &
antegrade manner along with PCN insertion. We report our experience with the FOSML position for the management of
ureterohydronephrosis in a single position. Materials and Methods: All patients who underwent urinary drainage for ureteral
obstruction secondary to advanced malignant disease in the FOSML position from January 2019 to February 2020 were
prospectively included in the study after meeting inclusion criteria. In all the cases, preference was given to DJ stent insertion. PCN
placement was performed after failure to stent the patient in both retrograde and antegrade attempts. Results: Out of 36 patients of
ureterohydronephrosis, 15 underwent retrograde DJ stent insertion, 3 patients had successful antegrade DJ stent insertion, and the
remaining 18 patients underwent PCN insertion after the failure of retrograde and antegrade ureteral stent placement. Conclusion:
FOSML position is safe and feasible for managing ureterohydronephrosis secondary to pelvic malignancy. It avoids the surgeon's
dependency on more than one position for urine drainage and saves crucial operative time.
Keywords: Single position; ureteral obstruction; management; FOSML