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No free air- no hole or perforations in the bowel resulting in air outside the bowel
No obstruction means that there is no evidence that there is any blockage in the colon which is good.
The prominent loop of bowel is thought to be due to redundant sigmoid colon
which means extra or excess of the sigmoid colon. The sigmoid colon is one aspect of the colon and the test is just saying that you have a little extra of it.
This is not associated with any significant complications.
I hope this helps