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### Selected Images
![Axial NECT shows acute subarachnoid hemorrhage <img src='/img/arrows/CC.png'/> in the basal cisterns and early extraventricular obstructive hydrocephalus with dilatation of all the ventricles and subtle periventricular hypodensity <img src='/img/arrows/CO.png'/> due to interstitial edema.](images/app.statdx.com_image_thumbnail_5111b0b3-10b0-4451-b80f-787287add3e4_annotated_true_size_900_quality_90_52e5b3da_20251018T164521Z.jpg)
*Axial NECT shows acute subarachnoid hemorrhage <img src='/img/arrows/CC.png'/> in the basal cisterns and early extraventricular obstructive hydrocephalus with dilatation of all the ventricles and subtle periventricular hypodensity <img src='/img/arrows/CO.png'/> due to interstitial edema.*
![Axial NECT shows acute subarachnoid hemorrhage <img src='img/arrows/CC.png'/> in the basal cisterns and early extraventricular obstructive hydrocephalus with dilatation of all the ventricles and subtle periventricular hypodensity <img src='img/arrows/CO.png'/> due to interstitial edema.](images/app.statdx.com_image_thumbnail_5111b0b3-10b0-4451-b80f-787287add3e4_annotated_true_size_900_quality_90_52e5b3da_20251018T164521Z.jpg)
*Axial NECT shows acute subarachnoid hemorrhage <img src='img/arrows/CC.png'/> in the basal cisterns and early extraventricular obstructive hydrocephalus with dilatation of all the ventricles and subtle periventricular hypodensity <img src='img/arrows/CO.png'/> due to interstitial edema.*
![Axial NECT shows acute subarachnoid hemorrhage <img src='/img/arrows/CC.png'/> in the basal cisterns and early extraventricular obstructive hydrocephalus with dilatation of all the ventricles and subtle periventricular hypodensity <img src='/img/arrows/CO.png'/> due to interstitial edema.](images/app.statdx.com_image_thumbnail_5111b0b3-10b0-4451-b80f-787287add3e4_size_174_quality_85_07f2e641_20251018T155131Z.jpg)
*Axial NECT shows acute subarachnoid hemorrhage <img src='/img/arrows/CC.png'/> in the basal cisterns and early extraventricular obstructive hydrocephalus with dilatation of all the ventricles and subtle periventricular hypodensity <img src='/img/arrows/CO.png'/> due to interstitial edema.*
![Axial NECT shows acute subarachnoid hemorrhage <img src='img/arrows/CC.png'/> in the basal cisterns and early extraventricular obstructive hydrocephalus with dilatation of all the ventricles and subtle periventricular hypodensity <img src='img/arrows/CO.png'/> due to interstitial edema.](images/app.statdx.com_image_thumbnail_5111b0b3-10b0-4451-b80f-787287add3e4_size_174_quality_85_07f2e641_20251018T155131Z.jpg)
*Axial NECT shows acute subarachnoid hemorrhage <img src='img/arrows/CC.png'/> in the basal cisterns and early extraventricular obstructive hydrocephalus with dilatation of all the ventricles and subtle periventricular hypodensity <img src='img/arrows/CO.png'/> due to interstitial edema.*
![Axial FLAIR MR images (top) in a patient with breast carcinoma leptomeningeal metastasis shows dilatation of the ventricles <img src='/img/arrows/CS.png'/> with mild periventricular interstitial edema <img src='/img/arrows/CO.png'/>. Axial T1 C+ MR (bottom) shows extensive leptomeningeal enhancement <img src='/img/arrows/CC.png'/> along the cerebellar folia.](images/app.statdx.com_image_thumbnail_d998cd4d-9969-40a5-af8f-4530c1fa1cf0_annotated_true_size_900_quality_90_19eb7d4c_20251018T164521Z.jpg)
*Axial FLAIR MR images (top) in a patient with breast carcinoma leptomeningeal metastasis shows dilatation of the ventricles <img src='/img/arrows/CS.png'/> with mild periventricular interstitial edema <img src='/img/arrows/CO.png'/>. Axial T1 C+ MR (bottom) shows extensive leptomeningeal enhancement <img src='/img/arrows/CC.png'/> along the cerebellar folia.*
![Axial FLAIR MR images (top) in a patient with breast carcinoma leptomeningeal metastasis shows dilatation of the ventricles <img src='img/arrows/CS.png'/> with mild periventricular interstitial edema <img src='img/arrows/CO.png'/>. Axial T1 C+ MR (bottom) shows extensive leptomeningeal enhancement <img src='img/arrows/CC.png'/> along the cerebellar folia.](images/app.statdx.com_image_thumbnail_d998cd4d-9969-40a5-af8f-4530c1fa1cf0_annotated_true_size_900_quality_90_19eb7d4c_20251018T164521Z.jpg)
*Axial FLAIR MR images (top) in a patient with breast carcinoma leptomeningeal metastasis shows dilatation of the ventricles <img src='img/arrows/CS.png'/> with mild periventricular interstitial edema <img src='img/arrows/CO.png'/>. Axial T1 C+ MR (bottom) shows extensive leptomeningeal enhancement <img src='img/arrows/CC.png'/> along the cerebellar folia.*
![Axial T2 MR in a 21-year-old patient with a remote history of meningitis shows chronic &quot;compensated&quot; extraventricular communicating hydrocephalus with marked dilatation of the lateral <img src='/img/arrows/CC.png'/> and 3rd ventricles <img src='/img/arrows/CS.png'/>.](images/app.statdx.com_image_thumbnail_99b1acc6-b089-48c5-bc97-c72d4bd09eb0_annotated_true_size_900_quality_90_dc39d287_20251018T164521Z.jpg)
*Axial T2 MR in a 21-year-old patient with a remote history of meningitis shows chronic &quot;compensated&quot; extraventricular communicating hydrocephalus with marked dilatation of the lateral <img src='/img/arrows/CC.png'/> and 3rd ventricles <img src='/img/arrows/CS.png'/>.*
![Axial T2 MR in a 21-year-old patient with a remote history of meningitis shows chronic &quot;compensated&quot; extraventricular communicating hydrocephalus with marked dilatation of the lateral <img src='img/arrows/CC.png'/> and 3rd ventricles <img src='img/arrows/CS.png'/>.](images/app.statdx.com_image_thumbnail_99b1acc6-b089-48c5-bc97-c72d4bd09eb0_annotated_true_size_900_quality_90_dc39d287_20251018T164521Z.jpg)
*Axial T2 MR in a 21-year-old patient with a remote history of meningitis shows chronic &quot;compensated&quot; extraventricular communicating hydrocephalus with marked dilatation of the lateral <img src='img/arrows/CC.png'/> and 3rd ventricles <img src='img/arrows/CS.png'/>.*
![Sagittal T1 MR in the same patient shows a patent widened cerebral aqueduct <img src='/img/arrows/CC.png'/> and foramen of Magendie <img src='/img/arrows/CS.png'/> with dilatation of the 4th ventricle <img src='/img/arrows/CO.png'/>. In longstanding &quot;compensated&quot; hydrocephalus, there is no periventricular interstitial edema around the ventricles, as in this case.](images/app.statdx.com_image_thumbnail_92b29be1-65a5-4179-9175-265ac3a16e7b_annotated_true_size_900_quality_90_3b9fecbf_20251018T164521Z.jpg)
*Sagittal T1 MR in the same patient shows a patent widened cerebral aqueduct <img src='/img/arrows/CC.png'/> and foramen of Magendie <img src='/img/arrows/CS.png'/> with dilatation of the 4th ventricle <img src='/img/arrows/CO.png'/>. In longstanding &quot;compensated&quot; hydrocephalus, there is no periventricular interstitial edema around the ventricles, as in this case.*
![Sagittal T1 MR in the same patient shows a patent widened cerebral aqueduct <img src='img/arrows/CC.png'/> and foramen of Magendie <img src='img/arrows/CS.png'/> with dilatation of the 4th ventricle <img src='img/arrows/CO.png'/>. In longstanding &quot;compensated&quot; hydrocephalus, there is no periventricular interstitial edema around the ventricles, as in this case.](images/app.statdx.com_image_thumbnail_92b29be1-65a5-4179-9175-265ac3a16e7b_annotated_true_size_900_quality_90_3b9fecbf_20251018T164521Z.jpg)
*Sagittal T1 MR in the same patient shows a patent widened cerebral aqueduct <img src='img/arrows/CC.png'/> and foramen of Magendie <img src='img/arrows/CS.png'/> with dilatation of the 4th ventricle <img src='img/arrows/CO.png'/>. In longstanding &quot;compensated&quot; hydrocephalus, there is no periventricular interstitial edema around the ventricles, as in this case.*
### Additional Images
![Axial T1WI C+ MR demonstrates subtle leptomeningeal enhancement in the left sylvian fissure <img src='/img/arrows/CO.png'/> in this patient with tuberculous meningitis. There is mild dilatation of the lateral ventricles <img src='/img/arrows/CS.png'/> due to extraventricular obstructive hydrocephalus.](images/app.statdx.com_image_thumbnail_2a43dda8-e5ae-43ec-94c6-0f57c803a451_annotated_true_size_900_quality_90_1b106673_20251018T164521Z.jpg)
*Axial T1WI C+ MR demonstrates subtle leptomeningeal enhancement in the left sylvian fissure <img src='/img/arrows/CO.png'/> in this patient with tuberculous meningitis. There is mild dilatation of the lateral ventricles <img src='/img/arrows/CS.png'/> due to extraventricular obstructive hydrocephalus.*
![Axial T1WI C+ MR demonstrates subtle leptomeningeal enhancement in the left sylvian fissure <img src='img/arrows/CO.png'/> in this patient with tuberculous meningitis. There is mild dilatation of the lateral ventricles <img src='img/arrows/CS.png'/> due to extraventricular obstructive hydrocephalus.](images/app.statdx.com_image_thumbnail_2a43dda8-e5ae-43ec-94c6-0f57c803a451_annotated_true_size_900_quality_90_1b106673_20251018T164521Z.jpg)
*Axial T1WI C+ MR demonstrates subtle leptomeningeal enhancement in the left sylvian fissure <img src='img/arrows/CO.png'/> in this patient with tuberculous meningitis. There is mild dilatation of the lateral ventricles <img src='img/arrows/CS.png'/> due to extraventricular obstructive hydrocephalus.*
![Coronal T1WI MR in a toddler with rapid head growth for 4 months shows enlarged ventricular trigone on the left and enlarging subarachnoid spaces at an age when they should be shrinking. MR venography showed occlusion of both transverse sinuses.](images/app.statdx.com_image_thumbnail_ebff970c-aa3e-4179-bbd9-c97acd72f056_annotated_true_size_900_quality_90_c2d1d8f1_20251018T164521Z.jpg)
*Coronal T1WI MR in a toddler with rapid head growth for 4 months shows enlarged ventricular trigone on the left and enlarging subarachnoid spaces at an age when they should be shrinking. MR venography showed occlusion of both transverse sinuses.*
![Axial NECT shows hyperdense material in the basal cisterns <img src='/img/arrows/BS.png'/> and sylvian fissures <img src='/img/arrows/BO.png'/> in acute subarachnoid hemorrhage. There is early dilatation of the ventricles <img src='/img/arrows/CO.png'/> with mild periventricular edema <img src='/img/arrows/CS.png'/> due to interstitial edema.](images/app.statdx.com_image_thumbnail_8ec2b8fa-6b76-4d89-b2ab-6f1f7e0a4d3c_annotated_true_size_900_quality_90_9e79e2bf_20251018T164521Z.jpg)
*Axial NECT shows hyperdense material in the basal cisterns <img src='/img/arrows/BS.png'/> and sylvian fissures <img src='/img/arrows/BO.png'/> in acute subarachnoid hemorrhage. There is early dilatation of the ventricles <img src='/img/arrows/CO.png'/> with mild periventricular edema <img src='/img/arrows/CS.png'/> due to interstitial edema.*
![Axial NECT shows hyperdense material in the basal cisterns <img src='img/arrows/BS.png'/> and sylvian fissures <img src='img/arrows/BO.png'/> in acute subarachnoid hemorrhage. There is early dilatation of the ventricles <img src='img/arrows/CO.png'/> with mild periventricular edema <img src='img/arrows/CS.png'/> due to interstitial edema.](images/app.statdx.com_image_thumbnail_8ec2b8fa-6b76-4d89-b2ab-6f1f7e0a4d3c_annotated_true_size_900_quality_90_9e79e2bf_20251018T164521Z.jpg)
*Axial NECT shows hyperdense material in the basal cisterns <img src='img/arrows/BS.png'/> and sylvian fissures <img src='img/arrows/BO.png'/> in acute subarachnoid hemorrhage. There is early dilatation of the ventricles <img src='img/arrows/CO.png'/> with mild periventricular edema <img src='img/arrows/CS.png'/> due to interstitial edema.*
![Axial NECT shows acute subarachnoid hemorrhage in the basal cisterns <img src='/img/arrows/CC.png'/> and sylvian fissures <img src='/img/arrows/CS.png'/>. There is early extraventricular obstructive hydrocephalus with mild periventricular hypodensity <img src='/img/arrows/CO.png'/> due to interstitial edema.](images/app.statdx.com_image_thumbnail_da3cea4c-f283-4f12-b661-5b1c2df2b201_annotated_true_size_900_quality_90_8c48b911_20251018T164521Z.jpg)
*Axial NECT shows acute subarachnoid hemorrhage in the basal cisterns <img src='/img/arrows/CC.png'/> and sylvian fissures <img src='/img/arrows/CS.png'/>. There is early extraventricular obstructive hydrocephalus with mild periventricular hypodensity <img src='/img/arrows/CO.png'/> due to interstitial edema.*
![Axial NECT shows acute subarachnoid hemorrhage in the basal cisterns <img src='img/arrows/CC.png'/> and sylvian fissures <img src='img/arrows/CS.png'/>. There is early extraventricular obstructive hydrocephalus with mild periventricular hypodensity <img src='img/arrows/CO.png'/> due to interstitial edema.](images/app.statdx.com_image_thumbnail_da3cea4c-f283-4f12-b661-5b1c2df2b201_annotated_true_size_900_quality_90_8c48b911_20251018T164521Z.jpg)
*Axial NECT shows acute subarachnoid hemorrhage in the basal cisterns <img src='img/arrows/CC.png'/> and sylvian fissures <img src='img/arrows/CS.png'/>. There is early extraventricular obstructive hydrocephalus with mild periventricular hypodensity <img src='img/arrows/CO.png'/> due to interstitial edema.*
![Axial T1WI C+ MR shows extensive leptomeningeal enhancement of the basal cisterns in neurosarcoidosis <img src='/img/arrows/CS.png'/>. Notice the early communicating hydrocephalus with the dilated 3rd ventricle <img src='/img/arrows/CC.png'/> and temporal horns <img src='/img/arrows/CO.png'/>.](f314f067-37d3-4bfe-b551-1dd1cd36f1e3)
*Axial T1WI C+ MR shows extensive leptomeningeal enhancement of the basal cisterns in neurosarcoidosis <img src='/img/arrows/CS.png'/>. Notice the early communicating hydrocephalus with the dilated 3rd ventricle <img src='/img/arrows/CC.png'/> and temporal horns <img src='/img/arrows/CO.png'/>.*
![Axial T1WI C+ MR shows extensive leptomeningeal enhancement of the basal cisterns in neurosarcoidosis <img src='img/arrows/CS.png'/>. Notice the early communicating hydrocephalus with the dilated 3rd ventricle <img src='img/arrows/CC.png'/> and temporal horns <img src='img/arrows/CO.png'/>.](f314f067-37d3-4bfe-b551-1dd1cd36f1e3)
*Axial T1WI C+ MR shows extensive leptomeningeal enhancement of the basal cisterns in neurosarcoidosis <img src='img/arrows/CS.png'/>. Notice the early communicating hydrocephalus with the dilated 3rd ventricle <img src='img/arrows/CC.png'/> and temporal horns <img src='img/arrows/CO.png'/>.*