What is a neuroepithelial cyst?
Neuroepithelial cysts are ependymal or epithelial lined fluid collections of unknown etiology within the central nervous system parenchyma with no obvious ventricular or subarachnoid connection. Most cysts are asymptomatic, however, some present with seizures, mass effect, or rarely with movement disorders.
Do ganglion cysts enhance on MRI?
At MR imaging, uncomplicated synovial and ganglion cysts demonstrate a thin rim and may have thin internal septa, both of which may enhance after gadolinium administration, with a lack of central enhancement otherwise (Fig 1) (2).
What is a hyperintense cyst?
These cysts are considered to be well-defined extra-axial lesions. On conventional MRI sequences, the signal intensity depends upon cyst contents. Neuroenteric cysts have been described to be iso- to mildly hyperintense on T1-weighted images and hyperintense on T2-weighted images due to the proteinaceous contents.
What is a thalamic cyst?
Thalamic neuroepithelial cysts are rare lesions of the central nervous system. Surgical management of these lesions has varied and yielded mixed results. The authors identified 10 reported cases in the literature, five of which involved symptomatic lesions.
What is choroidal fissure cyst?
Choroidal fissure cysts are benign intracranial cysts occurring at the level of choroidal fissure. They are usually asymptomatic and discovered incidentally. They are usually small, quite round and noncompressive3). Magnetic resonance imaging (MRI) signal characteristics are similar to cerebrospinalfluid (CSF).
Do Neuroglial cysts grow?
Most neuroglial cysts remain stable in size. Minimal but persistent intracystic CSF se- cretion may explain cyst expansion over time.
What does a ganglion cyst look like on an MRI?
MRI. Usually seen as a unilocular or multilocular rounded or lobular fluid signal mass, adjacent to a joint or tendon sheath. Very small cysts may simulate a small effusion, but a clue to the diagnosis is the paucity of fluid in the remainder of the joint and the focal nature of the fluid.
What is a T2 hypointense lesion?
T2 heterogeneous hypointense or mixed signal solid lesions have intermediate signal or T2 inhomogeneous signal with a mixture of T2 low and bright signal (higher than that of the outer myometrium or skeletal muscle). These may represent either benign or malignant lesions, either primary or secondary 3, 8.
What is thalamic lesion?
Background: Thalamic lesions are seen in a multitude of disorders including vascular diseases, metabolic disorders, inflammatory diseases, trauma, tumours, and infections.
Does MR imaging show Neuroepithelial cysts in the lateral ventricle?
The MR imaging appearance of neuroepithelial cysts in the lateral ventricle is reported. Two cases of proven and two of presumed intraventricular neuroepithelial cysts are presented, In one case, MR observations documented spontaneous regression of a large intraventricular cyst.
What are Neuroepithelial cysts?
Neuroepithelial cysts represent a heterogeneous group of lesions. These lesions have been called ependymal cysts, choroid plexus cysts, choroid-epithelial cysts, noncolloid cysts and subarachnoid-ependymal cysts among other terms.
Does an intraventricular cyst appear on MRI?
The MR imaging appearances in two cases of proven and two cases of presumed neuroepithelial cysts arising in the lateral ventricles are reported; two patients were symptomatic. A case of spontaneous regression of a large intraventricular cyst is also described.
Does cyst fluid look like CSF on MRI?
On MRI, the cyst fluid largely resembles CSF on both T1- and T2-weighted (T1W, T2W) images (Fig. 28-2). 4 However, the cyst fluid may appear slightly hyperintense to CSF on T1W images, because the cyst fluid has a slightly higher protein content than CSF.