I have operated a 30 yr old male pt c/o recurrent rif pain with vomiting, p/w, perforate appendicitis with large bowel obstruction due to adhesion of transverse colon along with omentum to appendicular lump and needed mobilization of lump from rif. So opened peritoneum at and lateral abdominal wall, adhesiolysis was done, lump was also removed preserving inflamed caecum, rest of the bowel was normal. Post operatively developed abdominal distention with no any leak confirmed , today is 8 th post op day, pt is passing flatus with bowel sounds are sluggishly present but still there is abdominal distention present.

In x-ray there are multiple air fluid levels, all investigations  are normal, no any sign of peritonitis, fever and vomiting also. Only abdominal distention and air fluid levels are present. Please reply, whether it is due to retroperitoneal collection, and if it is, then what…