Left cystectomy or left adnexectomy can be difficult in cases of frozen pelvis, with an adnexa entirely covered with the sigmoid colon and stuck to the pelvic sidewall. This video clearly demonstrates the advantages of the left retroperitoneal access to the adnexa, limiting the risks of injury of the ureter and the perforation of the sigmoid colon. The different steps of the operation are as follows: 1) Lysis of adhesions between the sigmoid colon and the left pelvic sidewall to visualize the tube. 2) Division of adhesions between the sigmoid colon and the uterus to visualize the left ovary. 3) Left retroperitoneal access to the ovary with a longitudinal incision of the peritoneum, laterally. 4) Division of the utero-ovarian pedicle. 5) Retroperitoneal dissection of the ureter to completely release the ovary from the ureter. 6) Lysis of the upper surface of the ovary from the sigmoid colon.