The CT (computed tomography) scan of paranasal sinuses (Figure 1) showed a radio-opaque foreign body (FB) in the left ethmoid sinus with opacification of all sinuses on the left side.

Background: The curative rate of radiotherapy for unresectable malignancies of the nasal cavity and paranasal sinuses was only 10-15%. Proton beams are characterized by their rapid fall-off at the ...