Relative exophthalmos in facial nerve palsy

Area of Science:

• Ophthalmology
• Neurology
• Medical Imaging

Background:

• Facial nerve (CN 7) palsy commonly causes ocular issues like lagophthalmos.
• The impact of CN 7 palsy on globe positioning remains under-investigated.
• Exophthalmos is hypothesized as a potential consequence of CN 7 palsy.

Purpose of the Study:

• To investigate whether CN 7 palsy affects globe positioning.
• To determine the extent of exophthalmos in patients with CN 7 palsy.
• To assess the implications of altered globe position in managing CN 7 palsy.

Main Methods:

• Retrospective analysis of 55 patients with unilateral CN 7 palsy.
• Utilized computed tomography (CT) scans to measure axial globe position.
• Employed two validated CT measurement methods correlating with Hertel exophthalmometry.

Main Results:

• A statistically significant relative exophthalmos was observed on the side affected by CN 7 palsy.
• Average exophthalmos measured 0.89 mm (Method 1) and 0.92 mm (Method 2).
• Acute Bell's palsy was the predominant etiology (76% of cases).

Conclusions:

• This study is the first to document changes in ocular globe position in CN 7 palsy.
• The presence of exophthalmos underscores the need to assess globe position in ophthalmologic care.
• Understanding globe positioning changes is vital for comprehensive management of CN 7 palsy.