Abstract
PURPOSE: To report evaluation of traumatic trochlear nerve palsy using head magnetic resonance imaging. DESIGN: Observational case reports. METHODS: We examined two cases involving trochlear nerve palsy after closed head injury. RESULTS: Using a fluid attenuated inversion recovery pulse sequence, MRI showed a high-intensity lesion consistent with subarachnoid hemorrhage at the trochlear nerve area in the ambient cisterns. CONCLUSION: An impact force directed toward the tentorium can be a mechanism of injury in some post-traumatic trochlear nerve palsies. Fluid attenuated inversion recovery pulse sequence is a sensitive method for detection of abnormalities in cases associated with head injury.
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