Oncologically safe minimally invasive management of a 25 cm cystic abdominopelvic mass using contained, controlled drainage and removal

•Novel laparoscopic technique allowing safe removal of large cystic abdominopelvic mass.•Posterior fornix entry provides controlled access in complex or limited-access cases.•Dual drawstring containment bag ensures sealed, spill-free drainage and removal.•Technique preserves ovarian function and avoids open surgery.