Persistently enlarged, but PET negative cervical node post chemorads for H & N Cancer

I occasionally run into this scenario where an initial 5cm cystic node shrinks to ~2cm and becomes PET negative at 12 weeks. In the absence of other findings, I'm curious what everyone else is doing in this situation.
Source: Student Doctor Network - Category: Universities & Medical Training Authors: Tags: Radiation Oncology Source Type: forums