Can concussion cause brain aneurysm?and 4 months after would complications show up by now?have headaches 2mon,i worry its complication from concussion

Concussion: Yes but a rare complication. After head trauma, an artery in the brain that is tethered or adjacent to the meninges can lead to tearing of an artery wall and formation of an aneurysm. The most common locations are the base of the skull and the pericallosal arteries along the falx cerebri. An MRI and MRA of the brain is used as a screening study to exclude a traumatic intracranial aneurysm.