<prompt> Cranial nerve most commonly involved in cranial aneurysms?3rd nerve4th nerve5th nerve6th nerve  <response>: ANSWER: A 3rd nerveREF: Harrisons 17th ed p. 1727Progressively enlarging cerebral aneurysm involves 3th, nerve completelyMost common nerve to be involved with raised intra cranial tension: 6thMost common nerve to be involved with false localising sign: 6thSaccular aneurysm is the most common type of intracranial aneurysmMost common location: anterior cerebral circulationAneurysms greater than 10 mm in diameter have a roughly 50 risk of bleeding per year 