A) Contrast-enhanced abdominal tomography scan. B) Intravesicular application of indocyanine green. C) Identification of the structures of the hepatocystic triangle. D) Intraoperative cholangiography. E) Positioning of the trocars. F) Transgastric trocars after intravenous injection of indocyanine green. G1-G3) Transgastric necrosectomy.