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Well circumscribed thin walled extra-axial CSF density mass in the right frontal area with remodelling effect on the adjacent bone. The remaining of the study is unremarkable.
Arachnoid cysts are asymptomatic benign lesions. They are usually located within the subarachnoid space and contain CSF.
On imaging they are characterised as well circumscribed thin walled cysts, displacing adjacent structures and following the CSF pattern (hypodense on CT and hyperintense on T2 with FLAIR suppression on MRI). They can also have a remodelling effect on the adjacent bone.