[Aberrant regeneration of the oculomotor nerve followed by intracranial aneurysm: case report].

To report a case of aberrant regeneration followed by acute palsy of the oculomotor nerve caused by intracranial aneurysm. A 59-year-old patient was attended in February 2006 complaining of headache with diplopia and blepharoptosis in the right eye. At the external ocular motility exam. Aduction, supraduction and infraduction defects with blepharoptosis in the right eye were observed. Regarding the internal ocular motility, mydriasis in the right eye. Acute palsy of the oculomotor nerve in the right eye was diagnosed and neurological examination was requested. At the Department of Neurosurgery, after having diagnosed aneurysm of the posterior communicating artery, the patient was submitted to an operation. In December 2006, it improvement of the aduction was observed, supraduction and infraduction defects remained and blepharoptosis improved during aduction of the right eye. In the internal ocular motility, miosis in the affected eye. The diagnosis of the aberrant regeneration of the oculomotor nerve after acute palsy was formulated based on anamnesis and ophthalmological follow-up tests.