Portal venous gas caused by barium swallow examination: an extremely rare clinical finding
Takuya Wakabayashi1, Kentaro Tominaga1*, Akira Sakamaki1, Shuji Terai1
1Division of Gastroenterology and Hepatology, Graduate School of Medical and Dental Sciences, Niigata University, 1-757, Aasahimachi-Dori, Chuo-Ku, Niigata, Japan