Presentation
Headache.
Patient Data
Age: 30 years
Gender: Male
From the case:
Arachnoid cyst
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Well circumscribed thin walled extra-axial CSF density mass in the right frontal area with remodeling effect on the adjacent bone. The remaining of the study is unremarkable.
Case Discussion
Arachnoid cysts are asymptomatic benign lesions. They are usually located within the subarachnoid space and contain CSF.
On imaging they are characterized 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 remodeling effect on the adjacent bone.