brain, spinal cord, and nerve disorders
Fourth Cranial Nerve (Trochlear Nerve) Palsy
Diagnosis of Fourth Cranial Nerve Palsy
Neurologic examination Computed tomography or magnetic resonance imaging Usually, 4th cranial nerve palsy is suspected if a person has characteristic limited eye movement. Computed tomography (CT) or magnetic resonance imaging (MRI) of the brain may be done to identify the cause. 