Review for 10.1186/s12876-022-02196-y (2022)

Reviewer’s report
Title: 
Biliary balloon dilator impaction in a non-dilated bile duct with
anatomical variations: a case report
Version: 
0 
Date: 
17 Jan 2021
Reviewer's report:
This paper reports "Biliary balloon dilator impaction in a non-dilated bile duct".
My comment is 
"Why was the balloon broken?"
Technical problems? Balloon problems? The patient and/or the stone problems?
It is not clear. It is a very important point in this paper. Because, finally, authors
retrieved the stone-and-balloon complex by grasping the sheath with rat-tooth
forceps. Contradictory to difficulty to remove the balloon at first, grasping the
sheath with rat-tooth forceps is an easy technique. In the Figure 2E and 2F, we
can see the dilated broken balloon. This balloon was not so deflated. I think this
episode is related with the balloon itself. But it is difficult to show the balloon
problems for authors. The reason of this complication is quite unclear.
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