The symptoms of headache, nausea and visual disturbances could be due to post concussion syndrome. The finding of Arachnoid cyst could be a coincidence. Formation of the cyst is not caused by trauma but complications of arachnoid cysts can occur when a cyst is damaged because of head trauma. Trauma may cause the fluid within a cyst to leak into other areas e.g., subarachnoid space. Blood vessels on the surface of a cyst may rupture and bleed into the cyst causing intracystic hemorrhage, increasing its size. If a blood vessel ruptures on the outside of a cyst, a collection of blood (hematoma) may result. In the cases of intracystic hemorrhage and hematoma, the individual may have symptoms of increased pressure within the cranium and signs of compression of nearby nerve tissue. This could have been the sequence of traumatic events in your case causing the headaches and visual problems. Please consult a neurologist for the treatment plan. Hope this helps you. Take care and regards!
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