From the anatomical relations between the posterior ethmoid cells and the optic nerve, it is conceivable that diseases in the posterior ethmoid cells could possibly involve the optic nerve.
The authors report 4 cases of postoperative mucocele nd pyocelye the posterior ethmoid sinus with little or no subjective symptoms meanwhile, who developed visual disturbance more than 20 years after the initial permaxillary sinusectomy.
The visual disturbance improved markedly after intranasal ethmoidal sinusectomies.
The authors discuss the usefulness of microsurgical technique in surgery of such cases.