This forum is for questions and support regarding neurology issues such as:
Alzheimer's Disease,
ALS,
Autism, Brain Cancer,
Cerebral Palsy, Chronic Pain,
Epilepsy,
Fibromyalgia, Headaches, MS, Neuralgia, Neuropathy, Parkinson's Disease, RSD, Sleep Disorders,
Stroke, Traumatic Brain Injury
It would be unlikely that the pineal cyst was caused by your accident. It was probably just an incidental finding on CT scan.
If there are no symptoms, you can opt to just observe it for the time being.
Hope this helps.