Including the ischiorectal fossa in anal cancer - yay/nay?

Australians say always include all of it. American and British say do not include unless clear evidence of spread through levator and even then only some of it. What's the answer? Does anyone actually follow the Australian advice and include the whole thing for every anal case? Doing something inbetween (giving more margin on muscle)?
Source: Student Doctor Network - Category: Universities & Medical Training Authors: Tags: Radiation Oncology Source Type: forums