Fig. 1.

Schematic diagram of injection therapy. a The needle is inserted into the healthy mucosal tissue surrounding the cyst at an angle of approximately 75 degrees to the mucosa, and the injection site is directed to the base of the cyst. b One-half of the total dose of BLM solution (2 mg/ml) is injected, and the base of the cyst swells. c The needle is slightly backed up and inserted into the cystic cavity, an empty tube syringe is replaced to aspirate the mucus, and the ranual shrivels up. d Replace back to the syringe with the BLM solution and inject the remaining BLM solution into the vesicle lumen until the lumen is full and unbroken