Extension to the orbit from paraorbital disease - The sinuses

Disease of the sinuses frequently involves the orbit. Infection, mucocele, and tumor of the sinuses originally may present with orbital findings. Imag ing attempts to evaluate the interface between sinus and orbit. Imaging fin dings reflect the integrity of the sinus mucosa, the thin bony wall, and th e more resistant fibrous periorbita. Both CT and MR imaging Flay a role in this evaluation.