Intracranial Aneurysm: A Rare Neurological Finding in Ankylosing Spondylitis.

Ankylosing spondylitis can present with various extra-articular manifestations. Vascular complications due to aortic aneurysm or aortitis have been documented. However, an association with intracranial vascular aneurysm is rarely reported. We report a case of a young male with positive HLA B27 ankylosing spondylitis, with extra-articular involvements, presented with recurrent unilateral headache. He was found to have an unruptured anterior communicating artery aneurysm. It was confirmed by a cerebral angiogram, and he was treated conservatively.