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Pneumopericardium due to ingestion of button battery:

Jai Prakash Soni ; Sandeep Choudhary ; Pramod Sharma.
http://www.annalspc.com/article.asp?issn=0974-2069;year=2016;volume=9;issue=1;spage=94;epage=95;aulast=Soni.  , 2016