Almost all cases of<unk>  develop as a sequel to nerve trauma. (The exception is when it is congenitally acquired as in Duane-Retraction Syndrome and Marcus Gunn phenomenon.) Trauma to the nerve can be induced in cases such as surgical procedures, nerve inflammation, neuroma, and physical injury.
Synkinesis
Myoclonus
Pseudoathetosis
Chorea 
Chorea
Aniseikonia
Myotonia
Parkinsonian gait