Multimedia
 | Media file 1: T2-weighted sagittal MRI image (see Image below for axial view) of the brain in a 28-year-old woman with an incidental finding of a superior cerebellar cistern arachnoid cyst (arrow). |
 | Media file 2: T2-weighted axial MRI image (see Image above for sagittal view) of the brain in a 28-year-old woman with an incidental finding of a superior cerebellar cistern arachnoid cyst (arrow). |
 | Media file 3: Unenhanced CT scan of the head in a 26-year-old man with a history of seizures since childhood (same patient as in Image below). The scan shows a large left frontoparietal cyst with a mass effect. The cyst was resected, and histologic analysis confirmed an arachnoid cyst. |
 | Media file 4: Unenhanced CT scan of the head in a 26-year-old man with a history of seizures since childhood (same patient as in Image above). The scan shows a large left frontoparietal cyst with a mass effect. The cyst was resected, and histologic analysis confirmed an arachnoid cyst. |
 | Media file 5: Axial T2-weighted MRI image through the midbrain, showing a right middle cranial fossa homogeneous lesion (same lesion as in Image below) with CSF signal intensity and no perceptible wall or internal complexity. There is associated remodeling of the adjacent sphenoid bone and brain displacement. These imaging features are typical of an arachnoid cyst. |
 | Media file 6: Axial T2-weighted MRI image through the body of the lateral ventricles, showing superior extension of a right middle cranial fossa lesion (same lesion as in Image above). The lesion is homogeneous, with no perceptible wall, no internal complexity, and CSF signal intensity. There is associated remodeling of the adjacent calvarium and brain displacement. These imaging features are typical of an arachnoid cyst. |
 | Media file 7: Coronal T1-weighted MRI image through a brain lesion (same lesion as in Images 5-6, 8), showing homogeneity of the lesion, lack of a perceptible wall, lack of internal complexity, and CSF signal intensity. There is associated remodeling of the adjacent calvarium and brain displacement. These imaging features are typical of an arachnoid cyst. |
 | Media file 8: Sagittal fluid-attenuated inversion recovery (FLAIR) weighted image through a brain lesion (same lesion as shown in Images 5-7), showing homogeneity of the lesion, lack of a perceptible wall, lack of internal complexity, and CSF signal intensity. There is associated remodeling of the adjacent sphenoid bone and brain displacement. These imaging features are typical of an arachnoid cyst. |
 | Media file 9: Prenatal coronal T1-weighted MRI images through the middle cranial fossa, showing a left temporal fossa homogeneous lesion (postnatal images of same patient shown in Images below) with CSF signal intensity and no perceptible wall or internal complexity. There is associated displacement of adjacent brain. These imaging features are typical of an arachnoid cyst. |
 | Media file 10: Postnatal coronal T2-weighted MRI images through the middle cranial fossa, showing a left temporal fossa homogeneous lesion (prenatal images of same patient shown in Images above and below) with CSF signal intensity and no perceptible wall or internal complexity. There is associated remodeling of adjacent calvarium, brain displacement, and a midline shift. These imaging features are typical of an arachnoid cyst. |
 | Media file 11: Postnatal coronal T1-weighted MRI images through the middle cranial fossa, showing a left temporal fossa homogeneous lesion (prenatal images of same patient shown in Image above) with CSF signal intensity and no perceptible wall or internal complexity. There is associated remodeling of adjacent calvarium, brain displacement, and a midline shift. These imaging features are typical of an arachnoid cyst. |
More on Arachnoid Cyst |
| Overview: Arachnoid Cyst |
| Imaging: Arachnoid Cyst |
 Multimedia: Arachnoid Cyst |
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| Further Reading |
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References
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Further Reading
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Keywords
arachnoid cyst, glioependymal cyst, meningeal cyst, intra-arachnoid cerebrospinal fluid–containing cysts, intracranial mass, leptomeningitis, arachnoid diverticula, spinal arachnoid cysts, intradural spinal arachnoid cysts, agenesis of corpus callosum, kyphoscoliosis, myelodysplasia, spinal dysraphism, intracystic hemorrhage, subdural hygroma, subdural hematoma, calvarial bulging, intracranial hypertension, craniomegaly, developmental delay, visual loss, precocious puberty, seizures, focal neurologic signs, temporal lobe agenesis, supratentorial cysts, chronic subdural hematomas, pneumosinus dilatans of sphenoid sinus, Cockayne syndrome, Menkes disease, spinal cord displacement, spinal cord compression, epidural arachnoid cysts
