PMC4533464_01
Computed tomography (CT) images showed a cystic lesion containing low density, cerebrospinal fluid (CSF)-like contents in the right anterior middle cranial fossa, suggesting arachnoid cyst (upper). Bone CT images revealed an association with a bony deformity of the posterior orbital wall, which was thinned and anteriorly swollen (lower).
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Computed tomography (CT) demonstrated outward and downward displacement of the right globe and low density fluid collection in the right middle cranial fossa, suggesting arachnoid cyst (Fig. 1). The cyst had thinned the anteromedial wall of the middle cranial fossa with a compressive sign of bony swallowing fossa against the orbital space on bone CT images (Fig. 1).
Magnetic resonance images showed cerebrospinal fluid (CSF)-like fluid collection in the cystic lesion and compressive findings against the posterior region of the orbit (upper: T2-weighted axial image, lower: T2-weighted sagittal image).
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Magnetic resonance images (MRIs) showed CSF-like fluid collection in the cystic lesion and compressive findings against the posterior region of the orbit (Fig. 2).
Postoperative computed tomography images showed decompression and shrinkage of the arachnoid cyst in the right middle cranial fossa.
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Cyst wall and the Liliequist membrane were incised and CSF inside the cyst became clear (Fig. 3). CSF inside the cyst communicated into the carotid cistern and cistern in the posterior cranial fossa (Fig. 3).