Presentation
Mild traumatic brain injury with no other abnormalities.
Patient Data
Age: 5 years
Gender: Male
From the case:
Arachnoid cyst - middle cranial fossa
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An extraaxial image is observed in the middle cranial fossa, with homogeneous low density with a mean density of 7 UH.
This case corresponds to type II arachnoid cyst according to Galassi's classification.
Case Discussion
Arachnoid cysts are benign, fluid-filled sacs that develop between the brain or spinal cord and the arachnoid membrane. They are typically congenital and often asymptomatic, discovered incidentally during imaging for unrelated reasons.
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