Arachnoid cysts are cerebrospinal fluid filled cysts located within the brain and/or spinal canal. Within the brain they are commonly found in the middle cranial fossa and rarely are found intracranially. They are more common in men, and normally appear on the left side of the brain. These cysts are typically asymptomatic. When symptoms do occur they can be headaches or seizures. Often arachnoid cysts are found accidentally with imaging. The best imaging to diagnosis arachnoid cysts is MRI; this is because special sequences such as FLAIR and diffusion weighted images can differienciate between arachnoid cysts and other types of cysts. Included are two T2 weighted MRI images of brains with arachnoid cysts.
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