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### Selected Images
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*Axial FLAIR MR in a patient with headache and vomiting demonstrates a colloid cyst at the foramen of Monro <img src='/img/arrows/CC.png'/> causing intraventricular obstructive hydrocephalus (IVOH) with dilatation of both lateral ventricles <img src='/img/arrows/CS.png'/>. Note thin rim of periventricular hyperintensity <img src='/img/arrows/CO.png'/> due to interstitial edema.*
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*Axial FLAIR MR in a patient with headache and vomiting demonstrates a colloid cyst at the foramen of Monro <img src='img/arrows/CC.png'/> causing intraventricular obstructive hydrocephalus (IVOH) with dilatation of both lateral ventricles <img src='img/arrows/CS.png'/>. Note thin rim of periventricular hyperintensity <img src='img/arrows/CO.png'/> due to interstitial edema.*
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*Axial FLAIR MR in a patient with headache and vomiting demonstrates a colloid cyst at the foramen of Monro <img src='/img/arrows/CC.png'/> causing intraventricular obstructive hydrocephalus (IVOH) with dilatation of both lateral ventricles <img src='/img/arrows/CS.png'/>. Note thin rim of periventricular hyperintensity <img src='/img/arrows/CO.png'/> due to interstitial edema.*
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*Axial FLAIR MR in a patient with headache and vomiting demonstrates a colloid cyst at the foramen of Monro <img src='img/arrows/CC.png'/> causing intraventricular obstructive hydrocephalus (IVOH) with dilatation of both lateral ventricles <img src='img/arrows/CS.png'/>. Note thin rim of periventricular hyperintensity <img src='img/arrows/CO.png'/> due to interstitial edema.*
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*Axial NECT in a patient with pineal region germinoma <img src='/img/arrows/CC.png'/> shows marked dilatation of the lateral ventricles <img src='/img/arrows/CO.png'/> and anterior 3rd ventricle <img src='/img/arrows/CS.png'/> with periventricular halo <img src='/img/arrows/WC.png'/> and diffuse effacement of the cortical sulci.*
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*Axial NECT in a patient with pineal region germinoma <img src='img/arrows/CC.png'/> shows marked dilatation of the lateral ventricles <img src='img/arrows/CO.png'/> and anterior 3rd ventricle <img src='img/arrows/CS.png'/> with periventricular halo <img src='img/arrows/WC.png'/> and diffuse effacement of the cortical sulci.*
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*Coronal T1 C+ MR in a patient presenting with headache and ataxia demonstrates a large heterogeneously enhancing mass <img src='/img/arrows/CO.png'/> in the left cerebellum with mass effect and effacement of the 4th ventricle <img src='/img/arrows/CC.png'/>. Biopsy revealed a glioblastoma.*
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*Coronal T1 C+ MR in a patient presenting with headache and ataxia demonstrates a large heterogeneously enhancing mass <img src='img/arrows/CO.png'/> in the left cerebellum with mass effect and effacement of the 4th ventricle <img src='img/arrows/CC.png'/>. Biopsy revealed a glioblastoma.*
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*Axial FLAIR MR in the same patient shows marked dilatation of the lateral ventricles <img src='/img/arrows/CC.png'/> with extensive periventricular interstitial edema <img src='/img/arrows/CS.png'/> caused by compromised drainage of interstitial fluid or transependymal CSF migration.*
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*Axial FLAIR MR in the same patient shows marked dilatation of the lateral ventricles <img src='img/arrows/CC.png'/> with extensive periventricular interstitial edema <img src='img/arrows/CS.png'/> caused by compromised drainage of interstitial fluid or transependymal CSF migration.*
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*Sagittal CISS MR in a patient with obstruction at the 4th ventricular outlet due to adhesions shows ballooning of the 4th ventricle <img src='/img/arrows/CO.png'/>, widening of the aqueduct of Sylvius <img src='/img/arrows/CC.png'/>, dilated 3rd and lateral ventricles with downward sloping of 3rd ventricular floor <img src='/img/arrows/CS.png'/>.*
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*Sagittal CISS MR in a patient with obstruction at the 4th ventricular outlet due to adhesions shows ballooning of the 4th ventricle <img src='img/arrows/CO.png'/>, widening of the aqueduct of Sylvius <img src='img/arrows/CC.png'/>, dilated 3rd and lateral ventricles with downward sloping of 3rd ventricular floor <img src='img/arrows/CS.png'/>.*
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*Axial FLAIR MR in a patient with tuberous sclerosis shows large subependymal giant cell astrocytoma <img src='/img/arrows/CS.png'/> causing obstructive hydrocephalus <img src='/img/arrows/CC.png'/> with mild periventricular edema <img src='/img/arrows/CO.png'/>. Note the subtle hyperintensity in the occipital lobe tuber <img src='/img/arrows/WO.png'/>.*
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*Axial FLAIR MR in a patient with tuberous sclerosis shows large subependymal giant cell astrocytoma <img src='img/arrows/CS.png'/> causing obstructive hydrocephalus <img src='img/arrows/CC.png'/> with mild periventricular edema <img src='img/arrows/CO.png'/>. Note the subtle hyperintensity in the occipital lobe tuber <img src='img/arrows/WO.png'/>.*
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*Sagittal CISS MR in a patient with aqueductal stenosis due to a thin web <img src='/img/arrows/CC.png'/> causing obstructive hydrocephalus is shown. High resolution thin-section T2 MR exquisitely delineates the CSF spaces and may demonstrate subtle abnormalities not detected on standard sequences.*
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*Sagittal CISS MR in a patient with aqueductal stenosis due to a thin web <img src='img/arrows/CC.png'/> causing obstructive hydrocephalus is shown. High resolution thin-section T2 MR exquisitely delineates the CSF spaces and may demonstrate subtle abnormalities not detected on standard sequences.*
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*Axial FLAIR MR in the same patient shows marked enlarged lateral ventricles <img src='/img/arrows/CO.png'/> with a very thin periventricular hyperintense rim <img src='/img/arrows/CC.png'/> and no sulcal effacement due to chronic compensated IVOH.*
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*Axial FLAIR MR in the same patient shows marked enlarged lateral ventricles <img src='img/arrows/CO.png'/> with a very thin periventricular hyperintense rim <img src='img/arrows/CC.png'/> and no sulcal effacement due to chronic compensated IVOH.*
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*Axial FLAIR MR in a patient with IVOH shows an ependymal cyst <img src='/img/arrows/CC.png'/> at the foramen of Monro with asymmetric dilatation of the lateral ventricles, L > R. There is marked bulging of the medial wall <img src='/img/arrows/CO.png'/> of the left lateral ventricle.*
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*Axial FLAIR MR in a patient with IVOH shows an ependymal cyst <img src='img/arrows/CC.png'/> at the foramen of Monro with asymmetric dilatation of the lateral ventricles, L > R. There is marked bulging of the medial wall <img src='img/arrows/CO.png'/> of the left lateral ventricle.*
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*Sagittal T1 MR in the same patient demonstrates the large medial atrial diverticula <img src='/img/arrows/CC.png'/>, which herniates inferiorly through the tentorial incisura into the posterior fossa, compressing the vermis <img src='/img/arrows/CO.png'/>, tectal plate <img src='/img/arrows/CS.png'/>, aqueduct, and 4th ventricle <img src='/img/arrows/WC.png'/>.*
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*Sagittal T1 MR in the same patient demonstrates the large medial atrial diverticula <img src='img/arrows/CC.png'/>, which herniates inferiorly through the tentorial incisura into the posterior fossa, compressing the vermis <img src='img/arrows/CO.png'/>, tectal plate <img src='img/arrows/CS.png'/>, aqueduct, and 4th ventricle <img src='img/arrows/WC.png'/>.*
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### Additional Images
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*Sagittal T1WI MR shows large mass within the 4th ventricle <img src='/img/arrows/BO.png'/> causing IVOH or noncommunicating hydrocephalus.*
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*Sagittal T1WI MR shows large mass within the 4th ventricle <img src='img/arrows/BO.png'/> causing IVOH or noncommunicating hydrocephalus.*
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*Sagittal T2WI MR in the same patient shows transependymal CSF flow, seen here as "fingers" extending into white matter around the enlarged lateral ventricle. The case was medulloblastoma with acute IVOH.*
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*Coronal T1 C+ MR shows IVOH with a large enhancing intraventricular mass <img src='/img/arrows/BS.png'/> causing marked enlargement of the lateral ventricles <img src='/img/arrows/WS.png'/>.*
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*Coronal T1 C+ MR shows IVOH with a large enhancing intraventricular mass <img src='img/arrows/BS.png'/> causing marked enlargement of the lateral ventricles <img src='img/arrows/WS.png'/>.*
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*Axial NECT in the same patient shows the large intraventricular mass <img src='/img/arrows/BS.png'/> within the 4th ventricle. Note the dilated temporal horns <img src='/img/arrows/WS.png'/>.*
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*Axial NECT in the same patient shows the large intraventricular mass <img src='img/arrows/BS.png'/> within the 4th ventricle. Note the dilated temporal horns <img src='img/arrows/WS.png'/>.*
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*Sagittal T1WI MR shows IVOH secondary to aqueductal stenosis and distal stenosis of cerebral aqueduct <img src='/img/arrows/BC.png'/>. Note the enlarged lateral and 3rd ventricles.*
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*Sagittal T1WI MR shows IVOH secondary to aqueductal stenosis and distal stenosis of cerebral aqueduct <img src='img/arrows/BC.png'/>. Note the enlarged lateral and 3rd ventricles.*
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*Axial FLAIR MR shows neurosarcoidosis and IVOH secondary to diffuse meningeal disease. Periventricular white matter hyperintensities <img src='/img/arrows/BS.png'/> are also present, as well as choroid involvement <img src='/img/arrows/WO.png'/>.*
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*Axial FLAIR MR shows neurosarcoidosis and IVOH secondary to diffuse meningeal disease. Periventricular white matter hyperintensities <img src='img/arrows/BS.png'/> are also present, as well as choroid involvement <img src='img/arrows/WO.png'/>.*
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*Coronal T1 C+ MR shows neurocysticercosis involvement within the 3rd ventricle and aqueduct <img src='/img/arrows/BS.png'/>, causing IVOH. The lateral ventricles are dilated.*
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*Coronal T1 C+ MR shows neurocysticercosis involvement within the 3rd ventricle and aqueduct <img src='img/arrows/BS.png'/>, causing IVOH. The lateral ventricles are dilated.*
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*Axial FLAIR MR shows neurocysticercosis resulting in IVOH. Large intraventricular cysts are present in the lateral vents <img src='/img/arrows/BS.png'/>, obstructing the foramina of Monro.*
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*Axial FLAIR MR shows neurocysticercosis resulting in IVOH. Large intraventricular cysts are present in the lateral vents <img src='img/arrows/BS.png'/>, obstructing the foramina of Monro.*
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*Axial T1WI MR shows a well-defined, hyperintense lesion <img src='/img/arrows/BO.png'/> at the foramen of Monro in a patient with headaches, most consistent with a colloid cyst. Note the enlargement of the lateral ventricles <img src='/img/arrows/BC.png'/> due to obstruction at the foramen of Monro.*
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*Axial T1WI MR shows a well-defined, hyperintense lesion <img src='img/arrows/BO.png'/> at the foramen of Monro in a patient with headaches, most consistent with a colloid cyst. Note the enlargement of the lateral ventricles <img src='img/arrows/BC.png'/> due to obstruction at the foramen of Monro.*
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*Sagittal T1WI C+ MR shows a homogeneously enhancing mass in the posterior 3rd ventricle <img src='/img/arrows/WO.png'/>, which causes obstruction and dilatation of the lateral and 3rd ventricles. On pathology, this was an astrocytoma.*
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*Sagittal T1WI C+ MR shows a homogeneously enhancing mass in the posterior 3rd ventricle <img src='img/arrows/WO.png'/>, which causes obstruction and dilatation of the lateral and 3rd ventricles. On pathology, this was an astrocytoma.*
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*Coronal T2WI MR shows a pilocytic astrocytoma centered in the right thalamus <img src='/img/arrows/CO.png'/> causing severe mass effect on the 3rd ventricle <img src='/img/arrows/CS.png'/> and resultant obstructive hydrocephalus <img src='/img/arrows/WC.png'/>.*
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*Coronal T2WI MR shows a pilocytic astrocytoma centered in the right thalamus <img src='img/arrows/CO.png'/> causing severe mass effect on the 3rd ventricle <img src='img/arrows/CS.png'/> and resultant obstructive hydrocephalus <img src='img/arrows/WC.png'/>.*
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*Axial T2WI MR demonstrates a well-defined CSF intensity cyst with the left temporal horn most consistent with an ependymal cyst <img src='/img/arrows/BO.png'/>. Note the dilated and trapped left temporal horn <img src='/img/arrows/BS.png'/>.*
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*Axial T2WI MR demonstrates a well-defined CSF intensity cyst with the left temporal horn most consistent with an ependymal cyst <img src='img/arrows/BO.png'/>. Note the dilated and trapped left temporal horn <img src='img/arrows/BS.png'/>.*
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*Sagittal T1WI C+ MR shows an enhancing mass in the pineal region <img src='/img/arrows/BS.png'/> causing mass effect on the tectal plate and aqueductal obstruction. Note the extensive leptomeningeal enhancement due to CSF spread of tumor. CSF cytology showed a primitive neuroectodermal tumor.*
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*Sagittal T1WI C+ MR shows an enhancing mass in the pineal region <img src='img/arrows/BS.png'/> causing mass effect on the tectal plate and aqueductal obstruction. Note the extensive leptomeningeal enhancement due to CSF spread of tumor. CSF cytology showed a primitive neuroectodermal tumor.*
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*Axial T2WI MR in a patient with corpus callosum impingement syndrome, after shunting for severe IVOH, shows a shunt tube <img src='/img/arrows/WC.png'/>, bilateral subdural fluid collections, and striated hyperintensity in the corpus callosum <img src='/img/arrows/BS.png'/> with somewhat less striking changes in the periventricular white matter <img src='/img/arrows/WO.png'/>. (Courtesy S. Candy, MD.)*
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*Axial T2WI MR in a patient with corpus callosum impingement syndrome, after shunting for severe IVOH, shows a shunt tube <img src='img/arrows/WC.png'/>, bilateral subdural fluid collections, and striated hyperintensity in the corpus callosum <img src='img/arrows/BS.png'/> with somewhat less striking changes in the periventricular white matter <img src='img/arrows/WO.png'/>. (Courtesy S. Candy, MD.)*
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*Axial NECT in a patient with headache demonstrates a classic colloid cyst at the foramen of Monro <img src='/img/arrows/CC.png'/> causing IVOH with dilatation of both lateral ventricles <img src='/img/arrows/CS.png'/>. Note the periventricular hypodensities <img src='/img/arrows/CO.png'/> due to transependymal leakage of CSF.*
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*Axial NECT in a patient with headache demonstrates a classic colloid cyst at the foramen of Monro <img src='img/arrows/CC.png'/> causing IVOH with dilatation of both lateral ventricles <img src='img/arrows/CS.png'/>. Note the periventricular hypodensities <img src='img/arrows/CO.png'/> due to transependymal leakage of CSF.*
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*Axial CECT demonstrates a subacute left posterior inferior cerebellar infarct <img src='/img/arrows/CS.png'/> causing mass effect on the 4th ventricle <img src='/img/arrows/CC.png'/> and resulting in obstructive hydrocephalus <img src='/img/arrows/CO.png'/>.*
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*Axial CECT demonstrates a subacute left posterior inferior cerebellar infarct <img src='img/arrows/CS.png'/> causing mass effect on the 4th ventricle <img src='img/arrows/CC.png'/> and resulting in obstructive hydrocephalus <img src='img/arrows/CO.png'/>.*
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*Axial FLAIR MR shows massive enlargement of the 3rd and lateral ventricles by a CSF-like mass within the 3rd ventricle <img src='/img/arrows/WS.png'/>. There is periventricular interstitial edema <img src='/img/arrows/WO.png'/>. At surgery, an ependymal cyst of the 3rd ventricle was found and fenestrated.*
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*Axial FLAIR MR shows massive enlargement of the 3rd and lateral ventricles by a CSF-like mass within the 3rd ventricle <img src='img/arrows/WS.png'/>. There is periventricular interstitial edema <img src='img/arrows/WO.png'/>. At surgery, an ependymal cyst of the 3rd ventricle was found and fenestrated.*
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*Sagittal T1 MR shows a large arachnoid cyst <img src='/img/arrows/CC.png'/> in the superior cerebellar cistern causing severe mass effect on the tectal plate <img src='/img/arrows/CS.png'/> and aqueduct <img src='/img/arrows/WC.png'/>.There is dilatation of the 3rd and lateral ventricles with thinning of the corpus callosum <img src='/img/arrows/CO.png'/>.*
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*Sagittal T1 MR shows a large arachnoid cyst <img src='img/arrows/CC.png'/> in the superior cerebellar cistern causing severe mass effect on the tectal plate <img src='img/arrows/CS.png'/> and aqueduct <img src='img/arrows/WC.png'/>.There is dilatation of the 3rd and lateral ventricles with thinning of the corpus callosum <img src='img/arrows/CO.png'/>.*
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*Sagittal T1WI C+ MR shows a cyst <img src='/img/arrows/WS.png'/> with an enhancing mural nodule <img src='/img/arrows/WO.png'/> of hemangioblastoma in the vermis, causing severe effacement of the 4th ventricle <img src='/img/arrows/WC.png'/> and obstructive hydrocephalus.*
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*Sagittal T1WI C+ MR shows a cyst <img src='img/arrows/WS.png'/> with an enhancing mural nodule <img src='img/arrows/WO.png'/> of hemangioblastoma in the vermis, causing severe effacement of the 4th ventricle <img src='img/arrows/WC.png'/> and obstructive hydrocephalus.*
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*Sagittal T2 MR demonstrates an enlarged T2 hyperintense tectal plate glioma <img src='/img/arrows/CC.png'/>, which causes obstruction at the aqueduct and dilatation of the lateral <img src='/img/arrows/CS.png'/> and 3rd ventricles <img src='/img/arrows/CO.png'/>.*
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*Sagittal T2 MR demonstrates an enlarged T2 hyperintense tectal plate glioma <img src='img/arrows/CC.png'/>, which causes obstruction at the aqueduct and dilatation of the lateral <img src='img/arrows/CS.png'/> and 3rd ventricles <img src='img/arrows/CO.png'/>.*
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