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### Selected Images
![Sagittal graphic shows obstructive hydrocephalus with markedly enlarged lateral and 3rd ventricles, a stretched (thinned) corpus callosum, and a funnel-shaped cerebral aqueduct <img src='/img/arrows/BS.png'/> related to distal obstruction. Note the normal size of the 4th ventricle and depression of the floor of the 3rd ventricle <img src='/img/arrows/BC.png'/> from the hydrocephalus.](images/app.statdx.com_image_thumbnail_b8037593-f2c6-448f-890c-33e3c832cfb8_annotated_true_size_900_quality_90_d08fbaed_20251018T165041Z.jpg)
*Sagittal graphic shows obstructive hydrocephalus with markedly enlarged lateral and 3rd ventricles, a stretched (thinned) corpus callosum, and a funnel-shaped cerebral aqueduct <img src='/img/arrows/BS.png'/> related to distal obstruction. Note the normal size of the 4th ventricle and depression of the floor of the 3rd ventricle <img src='/img/arrows/BC.png'/> from the hydrocephalus.*
![Sagittal graphic shows obstructive hydrocephalus with markedly enlarged lateral and 3rd ventricles, a stretched (thinned) corpus callosum, and a funnel-shaped cerebral aqueduct <img src='img/arrows/BS.png'/> related to distal obstruction. Note the normal size of the 4th ventricle and depression of the floor of the 3rd ventricle <img src='img/arrows/BC.png'/> from the hydrocephalus.](images/app.statdx.com_image_thumbnail_b8037593-f2c6-448f-890c-33e3c832cfb8_annotated_true_size_900_quality_90_d08fbaed_20251018T165041Z.jpg)
*Sagittal graphic shows obstructive hydrocephalus with markedly enlarged lateral and 3rd ventricles, a stretched (thinned) corpus callosum, and a funnel-shaped cerebral aqueduct <img src='img/arrows/BS.png'/> related to distal obstruction. Note the normal size of the 4th ventricle and depression of the floor of the 3rd ventricle <img src='img/arrows/BC.png'/> from the hydrocephalus.*
![Sagittal T2WI from a fetal MR at 25 weeks gestational age with aqueductal stenosis shows macrocephaly, lateral and 3rd ventriculomegaly, and no CSF in the cerebral aqueduct <img src='/img/arrows/CS.png'/>.](images/app.statdx.com_image_thumbnail_cfcc833d-ed65-4463-8b21-0a16f998b61a_annotated_true_size_900_quality_90_0f9aeb64_20251018T165041Z.jpg)
*Sagittal T2WI from a fetal MR at 25 weeks gestational age with aqueductal stenosis shows macrocephaly, lateral and 3rd ventriculomegaly, and no CSF in the cerebral aqueduct <img src='/img/arrows/CS.png'/>.*
![Sagittal T2WI from a fetal MR at 25 weeks gestational age with aqueductal stenosis shows macrocephaly, lateral and 3rd ventriculomegaly, and no CSF in the cerebral aqueduct <img src='img/arrows/CS.png'/>.](images/app.statdx.com_image_thumbnail_cfcc833d-ed65-4463-8b21-0a16f998b61a_annotated_true_size_900_quality_90_0f9aeb64_20251018T165041Z.jpg)
*Sagittal T2WI from a fetal MR at 25 weeks gestational age with aqueductal stenosis shows macrocephaly, lateral and 3rd ventriculomegaly, and no CSF in the cerebral aqueduct <img src='img/arrows/CS.png'/>.*
![Sagittal T1WI MR depicts proximal aqueductal stenosis <img src='/img/arrows/WS.png'/> producing enlargement of the lateral and 3rd ventricles with depression of the fornices <img src='/img/arrows/WC.png'/> in conjunction with normal 4th ventricle size. The tectum is dysplastic and thickened with collicular fusion <img src='/img/arrows/WO.png'/>.](images/app.statdx.com_image_thumbnail_691b95bc-abde-45e4-9c41-f468bff7e576_annotated_true_size_900_quality_90_5ca20c30_20251018T165041Z.jpg)
*Sagittal T1WI MR depicts proximal aqueductal stenosis <img src='/img/arrows/WS.png'/> producing enlargement of the lateral and 3rd ventricles with depression of the fornices <img src='/img/arrows/WC.png'/> in conjunction with normal 4th ventricle size. The tectum is dysplastic and thickened with collicular fusion <img src='/img/arrows/WO.png'/>.*
![Sagittal T1WI MR depicts proximal aqueductal stenosis <img src='img/arrows/WS.png'/> producing enlargement of the lateral and 3rd ventricles with depression of the fornices <img src='img/arrows/WC.png'/> in conjunction with normal 4th ventricle size. The tectum is dysplastic and thickened with collicular fusion <img src='img/arrows/WO.png'/>.](images/app.statdx.com_image_thumbnail_691b95bc-abde-45e4-9c41-f468bff7e576_annotated_true_size_900_quality_90_5ca20c30_20251018T165041Z.jpg)
*Sagittal T1WI MR depicts proximal aqueductal stenosis <img src='img/arrows/WS.png'/> producing enlargement of the lateral and 3rd ventricles with depression of the fornices <img src='img/arrows/WC.png'/> in conjunction with normal 4th ventricle size. The tectum is dysplastic and thickened with collicular fusion <img src='img/arrows/WO.png'/>.*
![Sagittal FIESTA of a 5 year old with aqueductal stenosis secondary to a small obstructing web <img src='/img/arrows/CS.png'/> is shown. This patient underwent a 3rd ventriculostomy <img src='/img/arrows/CC.png'/> and is doing well. There are no other brain anomalies.](images/app.statdx.com_image_thumbnail_7e7c9735-6651-40b7-92d2-9ba4c6ba4eb9_annotated_true_size_900_quality_90_58d84b56_20251018T165041Z.jpg)
*Sagittal FIESTA of a 5 year old with aqueductal stenosis secondary to a small obstructing web <img src='/img/arrows/CS.png'/> is shown. This patient underwent a 3rd ventriculostomy <img src='/img/arrows/CC.png'/> and is doing well. There are no other brain anomalies.*
![Sagittal FIESTA of a 5 year old with aqueductal stenosis secondary to a small obstructing web <img src='img/arrows/CS.png'/> is shown. This patient underwent a 3rd ventriculostomy <img src='img/arrows/CC.png'/> and is doing well. There are no other brain anomalies.](images/app.statdx.com_image_thumbnail_7e7c9735-6651-40b7-92d2-9ba4c6ba4eb9_annotated_true_size_900_quality_90_58d84b56_20251018T165041Z.jpg)
*Sagittal FIESTA of a 5 year old with aqueductal stenosis secondary to a small obstructing web <img src='img/arrows/CS.png'/> is shown. This patient underwent a 3rd ventriculostomy <img src='img/arrows/CC.png'/> and is doing well. There are no other brain anomalies.*
![Sagittal T2WI MR of a 5 day old with prenatal diagnosis of aqueductal stenosis demonstrates effacement of the cerebral aqueduct <img src='/img/arrows/CS.png'/> with thickening of the tectum <img src='/img/arrows/CC.png'/>.](images/app.statdx.com_image_thumbnail_6e7dc665-e001-4483-982c-34742a8c9f88_annotated_true_size_900_quality_90_8dc210af_20251018T165041Z.jpg)
*Sagittal T2WI MR of a 5 day old with prenatal diagnosis of aqueductal stenosis demonstrates effacement of the cerebral aqueduct <img src='/img/arrows/CS.png'/> with thickening of the tectum <img src='/img/arrows/CC.png'/>.*
![Sagittal T2WI MR of a 5 day old with prenatal diagnosis of aqueductal stenosis demonstrates effacement of the cerebral aqueduct <img src='img/arrows/CS.png'/> with thickening of the tectum <img src='img/arrows/CC.png'/>.](images/app.statdx.com_image_thumbnail_6e7dc665-e001-4483-982c-34742a8c9f88_annotated_true_size_900_quality_90_8dc210af_20251018T165041Z.jpg)
*Sagittal T2WI MR of a 5 day old with prenatal diagnosis of aqueductal stenosis demonstrates effacement of the cerebral aqueduct <img src='img/arrows/CS.png'/> with thickening of the tectum <img src='img/arrows/CC.png'/>.*
![Axial T1WI MR in the same patient demonstrates rhombencephalosynapsis <img src='/img/arrows/WS.png'/> and bilateral choanal atresia <img src='/img/arrows/BS.png'/>. Other anomalies in this patient included bilateral microphthalmia and tracheoesophageal fistula. This patient had a partial deletion of chromosome 3q and SOX2 gene mutation.](images/app.statdx.com_image_thumbnail_60101105-9030-4352-ac33-e49762486e93_annotated_true_size_900_quality_90_117f5060_20251018T165041Z.jpg)
*Axial T1WI MR in the same patient demonstrates rhombencephalosynapsis <img src='/img/arrows/WS.png'/> and bilateral choanal atresia <img src='/img/arrows/BS.png'/>. Other anomalies in this patient included bilateral microphthalmia and tracheoesophageal fistula. This patient had a partial deletion of chromosome 3q and SOX2 gene mutation.*
![Axial T1WI MR in the same patient demonstrates rhombencephalosynapsis <img src='img/arrows/WS.png'/> and bilateral choanal atresia <img src='img/arrows/BS.png'/>. Other anomalies in this patient included bilateral microphthalmia and tracheoesophageal fistula. This patient had a partial deletion of chromosome 3q and SOX2 gene mutation.](images/app.statdx.com_image_thumbnail_60101105-9030-4352-ac33-e49762486e93_annotated_true_size_900_quality_90_117f5060_20251018T165041Z.jpg)
*Axial T1WI MR in the same patient demonstrates rhombencephalosynapsis <img src='img/arrows/WS.png'/> and bilateral choanal atresia <img src='img/arrows/BS.png'/>. Other anomalies in this patient included bilateral microphthalmia and tracheoesophageal fistula. This patient had a partial deletion of chromosome 3q and SOX2 gene mutation.*
![Sagittal T1WI MR in a 2 day old with aqueductal stenosis with effacement of the aqueduct <img src='/img/arrows/CS.png'/> is shown. This patient also has diencephalic-mesencephalic dysplasia with incomplete separation of an enlarged massa intermedia from the midbrain <img src='/img/arrows/WO.png'/> with thickening of the 3rd ventricular floor <img src='/img/arrows/WS.png'/>.](images/app.statdx.com_image_thumbnail_7dec61fd-7d33-473d-a72a-826dbfe86d05_annotated_true_size_900_quality_90_6e98cdde_20251018T165041Z.jpg)
*Sagittal T1WI MR in a 2 day old with aqueductal stenosis with effacement of the aqueduct <img src='/img/arrows/CS.png'/> is shown. This patient also has diencephalic-mesencephalic dysplasia with incomplete separation of an enlarged massa intermedia from the midbrain <img src='/img/arrows/WO.png'/> with thickening of the 3rd ventricular floor <img src='/img/arrows/WS.png'/>.*
![Sagittal T1WI MR in a 2 day old with aqueductal stenosis with effacement of the aqueduct <img src='img/arrows/CS.png'/> is shown. This patient also has diencephalic-mesencephalic dysplasia with incomplete separation of an enlarged massa intermedia from the midbrain <img src='img/arrows/WO.png'/> with thickening of the 3rd ventricular floor <img src='img/arrows/WS.png'/>.](images/app.statdx.com_image_thumbnail_7dec61fd-7d33-473d-a72a-826dbfe86d05_annotated_true_size_900_quality_90_6e98cdde_20251018T165041Z.jpg)
*Sagittal T1WI MR in a 2 day old with aqueductal stenosis with effacement of the aqueduct <img src='img/arrows/CS.png'/> is shown. This patient also has diencephalic-mesencephalic dysplasia with incomplete separation of an enlarged massa intermedia from the midbrain <img src='img/arrows/WO.png'/> with thickening of the 3rd ventricular floor <img src='img/arrows/WS.png'/>.*
![Axial T2WI MR in the same patient demonstrates dilation of the lateral and 3rd ventricles with right ventricular diverticulum <img src='/img/arrows/CS.png'/> and multiple subependymal gray matter heterotopias <img src='/img/arrows/WS.png'/>.](images/app.statdx.com_image_thumbnail_89ddd8bc-0a66-4a10-ba6f-582e15706b98_annotated_true_size_900_quality_90_f90d73d0_20251018T165041Z.jpg)
*Axial T2WI MR in the same patient demonstrates dilation of the lateral and 3rd ventricles with right ventricular diverticulum <img src='/img/arrows/CS.png'/> and multiple subependymal gray matter heterotopias <img src='/img/arrows/WS.png'/>.*
![Axial T2WI MR in the same patient demonstrates dilation of the lateral and 3rd ventricles with right ventricular diverticulum <img src='img/arrows/CS.png'/> and multiple subependymal gray matter heterotopias <img src='img/arrows/WS.png'/>.](images/app.statdx.com_image_thumbnail_89ddd8bc-0a66-4a10-ba6f-582e15706b98_annotated_true_size_900_quality_90_f90d73d0_20251018T165041Z.jpg)
*Axial T2WI MR in the same patient demonstrates dilation of the lateral and 3rd ventricles with right ventricular diverticulum <img src='img/arrows/CS.png'/> and multiple subependymal gray matter heterotopias <img src='img/arrows/WS.png'/>.*
![Sagittal T1WI MR in a patient with Walker-Warburg syndrome shows severe tectal dysgenesis <img src='/img/arrows/WS.png'/> with aqueductal occlusion. Marked enlargement of the lateral ventricles more than the 3rd ventricle is present. A &quot;zigzag&quot; brainstem and very small cerebellum are characteristic of this syndrome.](images/app.statdx.com_image_thumbnail_803672c1-c4ea-4b63-9503-c1496c7e60c7_annotated_true_size_900_quality_90_ad19ef8f_20251018T165041Z.jpg)
*Sagittal T1WI MR in a patient with Walker-Warburg syndrome shows severe tectal dysgenesis <img src='/img/arrows/WS.png'/> with aqueductal occlusion. Marked enlargement of the lateral ventricles more than the 3rd ventricle is present. A &quot;zigzag&quot; brainstem and very small cerebellum are characteristic of this syndrome.*
![Sagittal T1WI MR in a patient with Walker-Warburg syndrome shows severe tectal dysgenesis <img src='img/arrows/WS.png'/> with aqueductal occlusion. Marked enlargement of the lateral ventricles more than the 3rd ventricle is present. A &quot;zigzag&quot; brainstem and very small cerebellum are characteristic of this syndrome.](images/app.statdx.com_image_thumbnail_803672c1-c4ea-4b63-9503-c1496c7e60c7_annotated_true_size_900_quality_90_ad19ef8f_20251018T165041Z.jpg)
*Sagittal T1WI MR in a patient with Walker-Warburg syndrome shows severe tectal dysgenesis <img src='img/arrows/WS.png'/> with aqueductal occlusion. Marked enlargement of the lateral ventricles more than the 3rd ventricle is present. A &quot;zigzag&quot; brainstem and very small cerebellum are characteristic of this syndrome.*
![Coronal T2WI MR in the same patient confirms marked ventriculomegaly, funnel-shaped cerebral aqueductal stenosis <img src='/img/arrows/WS.png'/>, fused fornices <img src='/img/arrows/BS.png'/>, and classic cobblestone lissencephaly.](images/app.statdx.com_image_thumbnail_3f80b454-0197-4bfd-a775-7b7c846e46a4_annotated_true_size_900_quality_90_9ac2b5aa_20251018T160013Z.jpg)
*Coronal T2WI MR in the same patient confirms marked ventriculomegaly, funnel-shaped cerebral aqueductal stenosis <img src='/img/arrows/WS.png'/>, fused fornices <img src='/img/arrows/BS.png'/>, and classic cobblestone lissencephaly.*
![Coronal T2WI MR in the same patient confirms marked ventriculomegaly, funnel-shaped cerebral aqueductal stenosis <img src='img/arrows/WS.png'/>, fused fornices <img src='img/arrows/BS.png'/>, and classic cobblestone lissencephaly.](images/app.statdx.com_image_thumbnail_3f80b454-0197-4bfd-a775-7b7c846e46a4_annotated_true_size_900_quality_90_9ac2b5aa_20251018T160013Z.jpg)
*Coronal T2WI MR in the same patient confirms marked ventriculomegaly, funnel-shaped cerebral aqueductal stenosis <img src='img/arrows/WS.png'/>, fused fornices <img src='img/arrows/BS.png'/>, and classic cobblestone lissencephaly.*
### Additional Images
![Coronal T2WI MR of the same neonate, on the 1st day of life, shows marked ventriculomegaly with asymmetric bilateral subdural hygromas following spontaneous ventricular decompression into the bilateral subdural spaces. This patient also has the additional midline congenital anomaly of rhombencephalosynapsis with characteristic incomplete dentate gyrus separation <img src='/img/arrows/BS.png'/> correlating with clinical truncal ataxia.](images/app.statdx.com_image_thumbnail_8cd11d10-23ae-4a94-96b5-f990d00e6278_annotated_true_size_900_quality_90_0f7423b8_20251018T160013Z.jpg)
*Coronal T2WI MR of the same neonate, on the 1st day of life, shows marked ventriculomegaly with asymmetric bilateral subdural hygromas following spontaneous ventricular decompression into the bilateral subdural spaces. This patient also has the additional midline congenital anomaly of rhombencephalosynapsis with characteristic incomplete dentate gyrus separation <img src='/img/arrows/BS.png'/> correlating with clinical truncal ataxia.*
![Coronal T2WI MR of the same neonate, on the 1st day of life, shows marked ventriculomegaly with asymmetric bilateral subdural hygromas following spontaneous ventricular decompression into the bilateral subdural spaces. This patient also has the additional midline congenital anomaly of rhombencephalosynapsis with characteristic incomplete dentate gyrus separation <img src='img/arrows/BS.png'/> correlating with clinical truncal ataxia.](images/app.statdx.com_image_thumbnail_8cd11d10-23ae-4a94-96b5-f990d00e6278_annotated_true_size_900_quality_90_0f7423b8_20251018T160013Z.jpg)
*Coronal T2WI MR of the same neonate, on the 1st day of life, shows marked ventriculomegaly with asymmetric bilateral subdural hygromas following spontaneous ventricular decompression into the bilateral subdural spaces. This patient also has the additional midline congenital anomaly of rhombencephalosynapsis with characteristic incomplete dentate gyrus separation <img src='img/arrows/BS.png'/> correlating with clinical truncal ataxia.*
![Sagittal T2WI MR of a neonate with severe congenital hydrocephalus, imaged on the 1st day of life, shows severe aqueductal stenosis <img src='/img/arrows/CS.png'/> and abnormal dysplastic tectal thickening <img src='/img/arrows/CO.png'/>. Severe congenital hydrocephalus has resulted in spontaneous decompression into the subdural spaces <img src='/img/arrows/BS.png'/>.](images/app.statdx.com_image_thumbnail_0163a4f7-18e5-4811-8e10-7cbfc0576f14_annotated_true_size_900_quality_90_d4c7a9c8_20251018T160014Z.jpg)
*Sagittal T2WI MR of a neonate with severe congenital hydrocephalus, imaged on the 1st day of life, shows severe aqueductal stenosis <img src='/img/arrows/CS.png'/> and abnormal dysplastic tectal thickening <img src='/img/arrows/CO.png'/>. Severe congenital hydrocephalus has resulted in spontaneous decompression into the subdural spaces <img src='/img/arrows/BS.png'/>.*
![Sagittal T2WI MR of a neonate with severe congenital hydrocephalus, imaged on the 1st day of life, shows severe aqueductal stenosis <img src='img/arrows/CS.png'/> and abnormal dysplastic tectal thickening <img src='img/arrows/CO.png'/>. Severe congenital hydrocephalus has resulted in spontaneous decompression into the subdural spaces <img src='img/arrows/BS.png'/>.](images/app.statdx.com_image_thumbnail_0163a4f7-18e5-4811-8e10-7cbfc0576f14_annotated_true_size_900_quality_90_d4c7a9c8_20251018T160014Z.jpg)
*Sagittal T2WI MR of a neonate with severe congenital hydrocephalus, imaged on the 1st day of life, shows severe aqueductal stenosis <img src='img/arrows/CS.png'/> and abnormal dysplastic tectal thickening <img src='img/arrows/CO.png'/>. Severe congenital hydrocephalus has resulted in spontaneous decompression into the subdural spaces <img src='img/arrows/BS.png'/>.*
![Coronal T2WI MR shows &quot;funneling&quot; of the aqueduct in the coronal plane <img src='/img/arrows/CS.png'/>, with a markedly distended ventricular system proximal to the stenotic aqueduct.](e30bbdfe-503f-454d-a570-d0d071adf442)
*Coronal T2WI MR shows &quot;funneling&quot; of the aqueduct in the coronal plane <img src='/img/arrows/CS.png'/>, with a markedly distended ventricular system proximal to the stenotic aqueduct.*
![Coronal T2WI MR shows &quot;funneling&quot; of the aqueduct in the coronal plane <img src='img/arrows/CS.png'/>, with a markedly distended ventricular system proximal to the stenotic aqueduct.](e30bbdfe-503f-454d-a570-d0d071adf442)
*Coronal T2WI MR shows &quot;funneling&quot; of the aqueduct in the coronal plane <img src='img/arrows/CS.png'/>, with a markedly distended ventricular system proximal to the stenotic aqueduct.*
![Sagittal T2WI MR shows massively distended 3rd and lateral ventricles with distal aqueductal stenosis <img src='/img/arrows/BS.png'/>. Note the severe stretching of the corpus callosum <img src='/img/arrows/BO.png'/> and depression of the fornices <img src='/img/arrows/BC.png'/>.](39652cf8-1cab-4160-a593-4f0796871390)
*Sagittal T2WI MR shows massively distended 3rd and lateral ventricles with distal aqueductal stenosis <img src='/img/arrows/BS.png'/>. Note the severe stretching of the corpus callosum <img src='/img/arrows/BO.png'/> and depression of the fornices <img src='/img/arrows/BC.png'/>.*
![Sagittal T2WI MR shows massively distended 3rd and lateral ventricles with distal aqueductal stenosis <img src='img/arrows/BS.png'/>. Note the severe stretching of the corpus callosum <img src='img/arrows/BO.png'/> and depression of the fornices <img src='img/arrows/BC.png'/>.](39652cf8-1cab-4160-a593-4f0796871390)
*Sagittal T2WI MR shows massively distended 3rd and lateral ventricles with distal aqueductal stenosis <img src='img/arrows/BS.png'/>. Note the severe stretching of the corpus callosum <img src='img/arrows/BO.png'/> and depression of the fornices <img src='img/arrows/BC.png'/>.*
![Sagittal T2WI MR reveals distal aqueductal stenosis with an enlarged, funnel-shaped cerebral aqueduct <img src='/img/arrows/CS.png'/> and mild abnormal tectal thickening. Note the lateral and 3rd ventriculomegaly with normal size of the 4th ventricle.](891e5fdf-9bb6-4085-b168-4e5738367176)
*Sagittal T2WI MR reveals distal aqueductal stenosis with an enlarged, funnel-shaped cerebral aqueduct <img src='/img/arrows/CS.png'/> and mild abnormal tectal thickening. Note the lateral and 3rd ventriculomegaly with normal size of the 4th ventricle.*
![Sagittal T2WI MR reveals distal aqueductal stenosis with an enlarged, funnel-shaped cerebral aqueduct <img src='img/arrows/CS.png'/> and mild abnormal tectal thickening. Note the lateral and 3rd ventriculomegaly with normal size of the 4th ventricle.](891e5fdf-9bb6-4085-b168-4e5738367176)
*Sagittal T2WI MR reveals distal aqueductal stenosis with an enlarged, funnel-shaped cerebral aqueduct <img src='img/arrows/CS.png'/> and mild abnormal tectal thickening. Note the lateral and 3rd ventriculomegaly with normal size of the 4th ventricle.*