Definitive radiotherapy for head-and-neck cancer with radiographically positive retropharyngeal nodes: Incomplete radiographic response does not necessarily indicate failure

Conclusions: Radiographic response at 4 weeks may not accurately reflect long-term locoregional control, as RP nodes may continue to resolve over time. The highest index of suspicion should be reserved for patients with progressive changes in size, focal lucency, or focal enhancement on serial imaging after RT.