[Third cranial nerve palsy related to an unruptured aneurysm of the posterior communicating artery].

The posterior communicating artery (PCA) aneurysm is a traditional cause of young subjects' painful ophthalmoplegia. We report the case of a patient presenting a complete, extrinsic and intrinsic, third cranial nerve palsy related to an unruptured aneurysm of the PCA. The diagnosis was made with the angio-CT, and the patient was treated with endovascular treatment for 6 days after the beginning of the cephalalgias. Recovery was complete at 8 weeks. We review the literature on the etiologies of this type of attack, the work-up, and the possible treatments.