In performing laparoscopic deroofing (LD) of liver cysts, indocyanine green (ICG) fluorescent imaging is particularly useful for delineating adequate margins for the procedure and for avoiding duct injuries. However, the optimal timing of ICG injection has not yet been clarified. Herein, we describe a patient who had a large liver cyst, in whom safe and efficient LD was performed under sharp fluorescent imaging obtained by intravenous injection of ICG 1 hour before cyst fenestration.

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