Figure 1 - uploaded by Esmaeil Fakharian
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Brain CT scan revealed an extra-axial cystic lesion in the left middle fossa and Sylvian fissure suggestive of arachnoid cyst.
Source publication
Arachnoid cysts are congenital lesions arising from the arachnoid membrane. The incidence of arachnoid cysts in the general population is around 0.1% and their most common location is the middle fossa. Arachnoid cysts usually present during the childhood and are identified incidentally. When symptomatic, the most common presentations include headac...
Context in source publication
Context 1
... meningeal signs were positive. Computed tomographic (CT) scan of brain ( Figure 1) showed a hypo-dense lesion in left middle cranial fossa partially squeezing the ventricular system without midline shift. Brain magnetic resonance imaging (MRI) showed the lesion in the same place, widening Sylvian fissure, compressing temporal lobe and squeezing lateral ventricles. The lesion had the similar intensity to cerebrospinal fluid (CSF). There was also fluid collection both in frontal subdural spaces hypo- intense on T1 (Figure 2) and hyper-intense on T2 images (Figure 3). The findings were suggestive of Sylvian fissure arachnoid cyst and bilateral subdural ...
