The one and a half syndrome is characterized by a conjugate horizontal gaze palsy in one direction and an impairment of the abduction of the eyes in the other. (T/F?)
Horizontal gaze palsy is seen on looking away from the side of the lesion. (T/F?)
The ipsilateral eye has no horizontal movement. (T/F?)
The most common cause of the one-and-a-half syndrome in the young people is Miller-Fisher syndrome. (T/F?)
The most common cause of the one-and-a-half syndrome in older people is multiple sclerosis. (T/F?)
When the lesion that causes a damage to PPRF or abducens nucleus and medial longitudinal fasciculus, also affects the facial nerve, we can talk about an eight-and-a-half syndrome. (T/F?)
Results in double vision, due to lesion of the medial longitudinal fasciculus (MLF), which connects the nuclei of oculomotor and abducens nerves. (T/F?)
Is always unilateral. (T/F?)
Diplopia is elicited with the gaze to the opposite side of the affected eye. (T/F?)
Affected eye shows impairment ( slower rate or failure ) of adduction. (T/F?)
Contralateral (not affected) eye shows vertical nystagmus with abduction. (T/F?)
If the left eye is affected, the patient will have diplopia when looking to the left. (T/F?)
With rostral MLF lesions, near the oculomotor nucleus, convergence of the eyes may be impaired. (T/F?)
Internuclear ophthalmoplegia is also called medial longitudinal fasciculus syndrome or MLF syndrome.
MLF syndrome can occur unilaterally or bilaterally. Bilateral internuclear ophthalmoplegia is highly suspected for multiple sclerosis, specially with young people.
Contralateral eye characteristically shows horizontal nystagmus with abduction.
If the left eye is affected, the patient will show horizontal diplopia with gaze to the opposite, right side.
