Figure 2. Small bowel partial dose-volume histograms depicting volumes of small bowel receiving 40, 50, and 60 Gy. Small bowel volumes included all intraperitoneal contents excluding the kidneys, liver, stomach, spleen, and gross target volume. The ‘safe region for complications’ was derived from data estimating the risk of late obstruction, perforation and fistula complications at 5 years after radiation treatment [7].