Fig. 1
Proportions of the recurrence covered or not covered by the initial target structures (low-dose PTV, high-dose PTV, GTV). Only one recurrence was located completely outside the initial PTV (patient 1) and was located within the surgical pathway. The mean proportions of the recurrence covered by the initial target structures were 48% (0–86%) for the GTV, 70% (0–100%) for the high-dose PTVhigh and 83% (0–100%) for the low-dose PTVlow. *Surgical pathway recurrence