case_images: PMC4521222_01
case_images: 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
case_images: SNI-6-120-g001.jpg
case_images: PMC4521222_01_SNI-6-120-g001.jpg
case_images: F1
case_images: 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].
case_images: Magnetic resonance imaging axial T2-weighted sequence demonstrating cystic perivascular spaces in midbrain tegmentum with local mass effect on aqueduct of Sylvius
case_images: SNI-6-120-g002.jpg
case_images: PMC4521222_01_SNI-6-120-g002.jpg
case_images: F2
case_images: There was mild associated hydrocephalus with distention of the lateral and third ventricles [Figure 2].
case_images: Postoperative magnetic resonance imaging sagittal T2-weighted sequence demonstrating decompression of cystic perivascular spaces and resolving distention of the third ventricle
case_images: SNI-6-120-g003.jpg
case_images: PMC4521222_01_SNI-6-120-g003.jpg
case_images: F3
case_images: There was a stable appearance of cystic lesions in the brain stem with some decrease in size [Figure 3].
case_images: Five-month follow-up computed tomography axial sequence showing decompression of lateral and third ventricles
case_images: SNI-6-120-g004.jpg
case_images: PMC4521222_01_SNI-6-120-g004.jpg
case_images: F4
case_images: At 5 months, headache, and diplopia had essentially resolved, and computed tomography scan showed well-decompressed cyst and ventricles [Figure 4].