Fig. 2
![Fig. 2](http://media.springernature.com/full/springer-static/image/art%3A10.1186%2Fs40792-021-01182-y/MediaObjects/40792_2021_1182_Fig2_HTML.jpg)
Follow-up abdominal plain CT performed 10 days after onset. a Coronal and b transaxial images reveal that the abdominal free space, including gas and the drainage tube (yellow arrow), communicates with the intraluminal space of the small intestine, which contains a slightly high-density spherical structure (white arrowhead) in the vicinity, via the perforation site (red arrowheads)