PMC4395937_01
T1-weighted images coronal: Well-defined cerebrospinal fluid signal intensity in prepontine, interpeduncular, suprasellar, anterior third ventricle with dilatation of third and both lateral ventricles
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F1
A 10-month-old female child brought by parents with H/O two episodes of generalized tonic clonic seizures, with involuntary bobbling of head over trunk since 1-month, On evaluation magnetic resonance imaging (MRI) showed well marginated cerebrospinal fluid (CSF) signal intensity cystic lesion in prepontine, interpeduncular, suprasellar, anterior third ventricle with moderate dilatation of third and both lateral ventricles [Figure 1].
T1-weighted images axial: Well-marginated cerebrospinal fluid signal intensity cystic lesion in prepontine, interpeduncular, suprasellar, anterior third ventricle with moderate dilatation of third and both lateral ventricles
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F2
Follow-up MRI [Figure 2] done after 4 years revealed significant decrease in cyst and resolution of hydrocephalus possibly due to early presentation and interventions, allowing developing brain to expand.
PMC4395937_02
T1-weighted image axial: Ventricular dilatation has significantly decreased with near normal size ventricles
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F3
Her computed tomography (CT) and MRI brain was suggestive of large third ventricular arachnoid cyst with mass effect over the brain stem and obstructive hydrocephalus [Figures 3 and 4].
T2 sagittal: Gross dilatation of body of lateral and third ventricle with fenestrations of cyst at superior and inferior aspect
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F4
Her computed tomography (CT) and MRI brain was suggestive of large third ventricular arachnoid cyst with mass effect over the brain stem and obstructive hydrocephalus [Figures 3 and 4].
Cyst bulging into foramen of monro
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F5
Cyst was bulging into the foramen of Monro; it was thick, tough, vascular, adherent to ventricular wall and stretching the third ventricular floor and anterior wall [Figures 5 and 6].
Thinned out third ventricular floor
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F6
Cyst was bulging into the foramen of Monro; it was thick, tough, vascular, adherent to ventricular wall and stretching the third ventricular floor and anterior wall [Figures 5 and 6].
PMC4395937_03
Computed tomography scan: Cerebrospinal fluid cystic lesion noted in suprasellar, prepontine, interpendicular, third ventricle with moderate obstructive hydrocephalus. Normal fourth ventricle
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F7
CT scan brain plain showed marked dilatation of lateral ventricles and third ventricles with a normal fourth ventricle [Figures 7 and 8].
Minimal decrease in cerebrospinal fluid density cystic lesion and obstructive hydrocephalus
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F8
CT scan brain plain showed marked dilatation of lateral ventricles and third ventricles with a normal fourth ventricle [Figures 7 and 8].