A 32-year-old female, G3P0A2, who was pregnant at gestational age 12 weeks, presented with acute onset left lower abdominal pain. Transabdominal ultrasonography showed left adnexal cystic mass 8.8*5.6cm. Under the impression of left ovarian corpus leutum cyst with torsion, she received emergent single-incision laparoscopic surgery. Under general anesthesia and endotracheal intubation, the patient was placed in the low lithotomy position. Single incision over umbilicus was made.The telescope was introduced through the umbilicus after establishing a pneumoperitoneum of 15 mmHg in pressure with Veress needle.