PMC5735433_01
Preoperative magnetic resonance imaging. The T2-weighted sagittal image (left) shows a large hyperintense retroclival cystic mass extending into interpeduncular and suprasellar cisterns, causing compression and posterior displacement of brain stem. The T1-weighted postgadolinium sagittal image (middle) shows a nonenhancing mass. Diffusion weighted image (right) demonstrates a mass lesion in interpeduncular cistern without restricted pattern
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F1
Magnetic resonance imaging (MRI) revealed a prepontine arachnoid cyst extending into the interpeduncular and suprasellar cisterns along with brainstem compression [Figure 1].
Computed tomography scan demonstrates no evidence of hydrocephalus
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F2
No evidence of hydrocephalus on computed tomography (CT) scan was visible [Figure 2].
Intraoperative transnasal endoscopic view after fenestration of the cyst into adjacent cisterns
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F3
The cyst was opened into the prepontine, interpeduncular, and suprasellar cisterns [Figure 3].
Postoperative magnetic resonance imaging. The T2-weighted axial (left) and sagittal (right) images show cyst shrinkage and decompression of brain stem
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F4
Follow-up MRI showed a decrease in the size of the cyst and decompression of the adjacent tissues [Figure 4].