Figure 2.

(a) Schematic representation of a relative change in tumor, fluid, and air volumes in the paranasal sinuses encompassing the tumor. The shrinkage of tumor in the right ethmoid sinus has resulted in increased aeration in the right ethmoid sinus. Due to improved drainage as a result of tumor shrinkage, there was also increased aeration of the sphenoid sinus posteriorly. (b) Tumor, fluid, and air content measured on pretreatment (first column) and repeat (second column) CTs for each patient.