Meconium peritonitis is an in utero sterile chemical peritonitis results from meconium leak into the peritoneal cavity through a bowel perforation. It might worth mentioning here that meconium calcifies rapidly within the peritoneum, sometimes within 24 hrs.  

The case was diagnosed prenatally in an outer facility and unfortunately, we could not obtain the prenatal imaging.

 At surgery, they found a distal ileal perforation with huge cyst occupying most of the right abdomen. The cyst contained a large amount of meconium and air within it and caused an extrinsic compression over the transverse colon resulting in a colonic obstruction at this level. They were extensive adhesions between the cyst and anterior abdomen wall and surrounding bowel loops.