Table 23.4.

Peritoneal surface disease severity score

Clinical	PCI	Histology [colonic/appendiceal]
No symptoms 0 points	PCI <10 1 point	Well differentiated Moderately differentiated/N0 Low-grade mucinous neoplasm 1 point
Mild symptoms 1 point	PCI 10–20 3 points	Moderately differentiated/N1 or N2 Mucinous adenocarcinoma 3 points
Severe symptoms 6 points	PCI >20 7 points	Every poorly differentiated Every signet ring High-grade mixed adenocarcinoma and goblet cell carcinoma 9 points

Modified from Pelz et al. [12]