Trochlear myokymia secondary to cerebellopontine angle arachnoid cyst

Abstract

Superior oblique myokymia (SOM) is a rare disorder with an unclear pathogenesis. We describe a first reported case of chronic disabling SOM in association with a cerebellopontine angle arachnoid cyst, who had a gradual and eventually complete symptomatic resolution 8 months following cyst marsupialisation. Among other aetiologies, SOM may therefore be due to abnormal CSF flow dynamics resulting in structural compromise of the nerve.

Keywords::

• superior oblique myokymia
• arachnoid cyst
• cerebrospinal fluid
• trochlear nerve
• cerebellopontine angle

Declaration of interest: The authors report no conflicts of interest. The authors alone are responsible for the content and writing of the paper.