"We observed the presence of portal venous gas associated with intestinal pneumatosis in 25.5% of cases. In patients having both IP and PVG intestinal infarction was observed in 69.2% of cases."

Intestinal Pneumatosis in adults: diagnostic and prognostic value
Lassandro F et al.
Emerg Radiol (2010) 17:361-365

"We have retrospectively evaluated 102 patients correlating the CT finding of gastrointestinal parietal gas with clinical data and outcome. Fifty three patients (52%) had surgical evidence of intestinal infarction."

Intestinal Pneumatosis in adults: diagnostic and prognostic value
Lassandro F et al.
Emerg Radiol (2010) 17:361-365

" In our study intestinal pneumatosis has been observed in a broad range of lesions with very different prognosis, the most frequent of which was intestinal infarction. When associated with portal venous gas, there was a much higher prevalence of intestinal infarct, and the prognosis was definitely worse."

Intestinal Pneumatosis in adults: diagnostic and prognostic value
Lassandro F et al.
Emerg Radiol (2010) 17:361-365