“…A break of the intestinal mucosa permits air to pass, and under pressure, gases in the lumen invade to the submucosa. Although PCI mayoccur in the absence of the primary disorder, it is usually associated with intestinal obstruction, inflammation, ulceration, diverticula, tumors, collagen disease, medical procedures such as endoscopy and operation, hypoxemia, chemoradiotherapy in malignancies (1 , 2), and organ transplantation under immunosuppression (3)(4)(5). Concerning the bacterial theory, Stevenson et al (6) reported that severe enterocolitis of the newborncaused the figure of PCI.…”