Fig.Ā 1From: The depth of perineural invasion is an independent prognostic factor for stage II colorectal cancerHematoxylin and eosin staining of three types of perineural invasion. The arrow represents the tumor, and * represents the nerve. A PNI in the submucosal plexus. B PNI in the myenteric plexus. C PNI in the subserous plexusBack to article page