Double Posterior Communicating Artery as a cause of Oculomotor Nerve Palsy

Amongst clinicians the diagnostic approach differs to patients presenting with isolated third cranial nerve palsy. Some issues remain controversial and the management of this condition is a challenge. In a 38-year-old male presenting with pupil-involving oculomotor nerve palsy (internal dysfunction) the cause was found to be a double posterior communicating artery; a very rare cause of third nerve palsy.