Dear patient, Thanks for your question. Signs of stroke include changes in speech, such as slurred speech, difficulty finding words, confusion, motor deficits such as gait imbalance, weakness of one arm, leg or one side of the body, facial asymmetry, and with posterior strokes vertigo, nausea, balance problems, gait disturbance. Arachnoid cysts are usually not associated with increased risk of stroke. I suggest seeking a consultation with a neurology stroke specialist; you may require specific brain imaging such as MRA or an angiogram. Hope this helps wish you the best, Dr Brenes-Salazar MD Mayo Clinic MN Cardiology