Cranial nerve injury after minor head trauma

Area of Science:

• Neurology
• Traumatology
• Neurosurgery

Background:

• Mild head trauma, defined by a Glasgow Coma Scale Score of 14-15, is common.
• Cranial nerve (CN) injuries are not well-documented in mild head trauma cases.
• Understanding CN injury patterns and outcomes is crucial for patient management.

Purpose of the Study:

• To determine the incidence of CN injury after mild head trauma.
• To correlate initial computed tomography (CT) findings with 1-year outcomes.
• To analyze the types and distribution of CN palsies in this patient cohort.

Main Methods:

• A consecutive series of 49 patients with minor head trauma and CN lesions were analyzed.
• Clinical, neurological, and CT examinations (brain and bone windows) were performed.
• Patients were followed for 1 year, with recovery graded as none, partial, or complete.

Main Results:

• Posttraumatic single nerve palsy occurred in 77.6% of patients; multiple injuries in 22.4%.
• Olfactory (CN I), facial (CN VII), and oculomotor (CNs III, IV, VI) nerves were most frequently affected.
• CN deficits at 1 year were more common in patients with skull base fractures (81.2%) compared to other CT abnormalities (60%) or no CT lesions (30%).

Conclusions:

• Mild head trauma can lead to CN palsies with distributions similar to moderate or severe injuries.
• Olfactory, facial, and oculomotor nerves are most susceptible.
• Oculomotor nerve injury prognosis is better when initial CT scans show no lesions.