An abdominal cocoon is the formation of a fibro-collagenous membrane that surrounds the small bowel like the larval cocoon. We present a rare case of abdominal cocoon presenting as a subacute intestinal obstruction in a patient with partial midgut malrotation. The case was confirmed with CT after initial clinical examination. The patient underwent laparotomy with excision of the sac and adhesiolysis followed by an uneventful recovery. Since idiopathic abdominal cocoon is rare and so is its manifestation as subacute intestinal obstruction, we wish to add this case to the current scientific literature.