PMC6351327_01
(A) Endoscopic view of the gastroduodenal invagination of a balloon-tipped gastrostomy tube. (B) Endoscopic view of the proper position of balloon tip.
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F1
Emergency endoscopy revealed that the balloon tip had migrated and was stuck in the duodenal bulb (Fig. 1A), causing a gastric outlet obstruction called ball valve syndrome (BVS). Prompt deflation of the balloon was performed, and the balloon tip was returned to its proper position (Fig. 1B).