Ophthalmoplegic migraine was previously considered as a subtype of migraine.
Now it is classified as a cranial neuralgia.
It is characterised by recurrent attacks of migranous type headache associated with paresis of one or more ocular cranial nerves.
Oculomotor palsy is the most common.
But abducent and trochlear nerves can also be involved.
There is no visual loss.
It usually occurs in children less than 10 years old.
An inflammatory etiology is proposed.
The prognosis is generally good.
The headache is usually relieved within 1 week.
But the ophthalmologic abnormalities may take days or weeks to resolve.

Ref : Pediatric neurology: a …

It starts in early adolescence
Bilateral myoclonic jerks are seen
Mostly in the morning
Precipitated by sleep deprivation
The patient usually remains conscious during the episode
Associated with absence seizures and generalised tonic clonic seizures
Benign condition
Complete remission is uncommon
Positive family history may be present
Responds well to anticonvulsants
Drug of choice – Valproate

Sunderland Classification of Nerve Injury has 5 degrees:

Axoplasmic flow obstruction (neurapraxia)
Axon destroyed (axonotmesis)
Endoneurium destroyed (neurotmesis))
Perineurium destroyed
Epineurium destroyed (complete transection with loss of continuity)