PMC4521222_01
Magnetic resonance imaging sagittal T2-weighted sequence demonstrating cystic perivascular spaces in midbrain tegmentum with distention of the third ventricle and bowing of the corpus callosum
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F1
Magnetic resonance imaging (MRI) without contrast showed a stable cluster of three cysts centered within the tegmentum of the right midbrain, which in aggregate measured 2.2 cm x 1.4 cm x 1.4 cm [Figure 1].
Magnetic resonance imaging axial T2-weighted sequence demonstrating cystic perivascular spaces in midbrain tegmentum with local mass effect on aqueduct of Sylvius
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F2
There was mild associated hydrocephalus with distention of the lateral and third ventricles [Figure 2].
Postoperative magnetic resonance imaging sagittal T2-weighted sequence demonstrating decompression of cystic perivascular spaces and resolving distention of the third ventricle
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F3
There was a stable appearance of cystic lesions in the brain stem with some decrease in size [Figure 3].
Five-month follow-up computed tomography axial sequence showing decompression of lateral and third ventricles
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F4
At 5 months, headache, and diplopia had essentially resolved, and computed tomography scan showed well-decompressed cyst and ventricles [Figure 4].