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Background: Tokyo Guidelines 2018, clinical practice guidelines for acute cholangitis and cholecystitis, recommend bailout procedures to prevent bile duct injury (BDI) during laparoscopic cholecystectomy (LC) for difficult gallbladder. We first insert an additional port (AP) for difficult gallbladder that may require bailout procedures. Because the usefulness of an AP during LC is unclear, we therefore examined the efficacy of the AP during LC in this study., Methods: Data were collected from 115 patients who underwent LC for acute cholecystitis in our department. The indications for AP were excessive bleeding, scarring, and poor visual field around Calot's triangle. AP was inserted into the right middle abdomen so as not to interfere with other trocars and was used by the assistant. Surgical outcomes were evaluated based on AP use during LC., Results: AP was inserted in 19 patients during LC (AP group). The indications for AP were excessive bleeding in nine patients, scarring around Calot's triangle in seven patients, and poor visual field around Calot's triangle in three patients. Open conversion was performed in two patients in the non-AP group. BDI occurred in one patient in the non-AP group. In patients with Difficulty Score 3, operation time was significantly shorter (P = .038) and Critical View of Safety (CVS) score was significantly higher in the AP group (P = .046)., Conclusion: AP is useful in patients with excessive bleeding to shorten operation time and increase the CVS score. AP may be one useful option for difficult gallbladder., (© 2022 Asia Endosurgery Task Force and Japan Society of Endoscopic Surgery and John Wiley & Sons Australia, Ltd.)