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The cisterna magna (posterior cerebellomedullary cistern, [1] or cerebellomedullary cistern [2] [3]) is the largest of the subarachnoid cisterns.It occupies the space created by the angle between the caudal/inferior surface of the cerebellum, and the dorsal/posterior surface of the medulla oblongata (it is created by the arachnoidea that bridges this angle [3]).
The authors noted that this form would previously have been classified as simply mega–cisterna magna. [ 2 ] [ 6 ] In 1999, Calabró et al. first used the phrase Dandy–Walker continuum when referring to proposals that a condition known as Blake's pouch cyst falls under the umbrella of the Dandy–Walker complex proposed by Barkovich. [ 3 ]
Most arachnoid cysts are asymptomatic, and do not require treatment. Where complications are present, leaving arachnoid cysts untreated may cause permanent severe neurological damage due to the progressive expansion of the cyst(s) or hemorrhage (bleeding). [2] However, with treatment most individuals with symptomatic arachnoid cysts do well.
Arachnoid cyst: A defect caused when CSF forms a collection that is trapped in the arachnoid membranes. The resulting cyst can then block the normal flow of CSF from the brain resulting in hydrocephalus as well as other defects. The most common locations for an arachnoid cyst are the middle fossa and the posterior fossa. The most common ...
Treatment is often largely dependent on the type of cyst. Asymptomatic cysts, termed pseudocysts , normally require active monitoring with periodic scans for future growth. [ 7 ] Symptomatic (producing or showing symptoms) cysts may require surgical removal if they are present in areas where brain damage is unavoidable, or if they produce ...
Its floor is formed by the arachnoid membrane extending between the temporal lobes of either side. [2] Anteriorly, it extends to the optic chiasm. [1] The cistern communicates superiorly with the chiasmatic cistern, and inferiorly with the pontine cistern. [3]
The cistern of lateral cerebral fossa [1] (also cistern of the lateral sulcus, or Sylvian cistern [2]) is an elongated [3] subarachnoid cistern formed by arachnoid mater bridging the lateral sulcus between the frontal, temporal, and parietal opercula.
Absent tibia-polydactyly-arachnoid cyst syndrome, also known as Holmes-Collins syndrome, is a very rare multi-systemic hereditary disorder which is characterized by facial dysmorphisms, [1] pre/post-axial polydactyly, toe syndactyly, missing/underdeveloped tibia bone, and the presence of a retrocerebellar arachnoid cyst.