Purpose: Accurate contouring in head and neck cancer (HNC) is critical. International consensus guidelines recommend the 5 + 5 mm rule for expansions around the primary tumor. wherein high- and low-dose clinical target volumes (CTV-P1 and CTV-P2. respectively) are created using successive 5 mm expansions on the gross tumor volume. https://www.markbroyard.com/deal-time-gtech-airram-mk2-k9-roller-roll-brush-bar-filter-vacuum-cleaner-hot-on-sale-best-find/