Review for 10.1186/s12876-022-02156-6 (2022)

Reviewer’s report
Title: 
Cholangiocarcinoma presenting as dysphagia and misdiagnosed as
gastritis: A case report
Version: 
0 
Date: 
25 Jan 2021
Reviewer's report:
This is an interesting case, but I think there was insufficient evidence that this
case was an ectopic bile duct-derived cancer.
Was there any ectopic bile duct tissue on the margin of the cancer in the
stomach? If there is ectopic bile duct tissue that has not become cancerous, and if
the ectopic bile duct tissue is connected the cancer, I think it will be the cancer
derived from ectopic bile duct tissue in the stomach.
If the cancer lesion has a site of intramucosal cancer of the stomach, it is difficult
to rule out the possibility of cancer derived from the stomach. Please also
mentions the reason for denying cancer derived from the stomach.
In addition, the pathological stage including the depth of invasion and lymph
node metastasis should be described.
Since this is a case report, I think it is necessary to present endoscopic findings
by photograph. Are you not measuring other tumor markers? Tumor markers that
did not rise should also be listed as negative findings.
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Is the study design appropriate to answer the research question (including the use
of appropriate controls), and are the conclusions supported by the evidence
presented?
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