Unilateral isolated abducens nerve paralysis: an unexpected complication of frontal mucocele.

Although paranasal sinus mucoceles are benign lesions, they are important because of the destruction they form in the bone structure in sinus wall. They are observed most frequently in frontal sinus; especially at this location, they may cause serious pathologic lesions in the neighboring structures as the orbit and cranium. Paranasal sinus mucoceles can be treated with open or closed endoscopic surgical methods.