ARACHNOID CYST
\ɐɹˈaknɔ͡ɪd sˈɪst], \ɐɹˈaknɔɪd sˈɪst], \ɐ_ɹ_ˈa_k_n_ɔɪ_d s_ˈɪ_s_t]\
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Intracranial or spinal cavities containing a cerebrospinal-like fluid, the wall of which is composed of arachnoidal cells. They are most often developmental or related to trauma. Intracranial arachnoid cysts usually occur adjacent to arachnoidal cistern and may present with HYDROCEPHALUS; HEADACHE; SEIZURES; and focal neurologic signs. Spinal arachnoid cysts may be extradural, intradural, or perineural and tend to present with signs and symptoms indicative of a RADICULOPATHY. (From Joynt, Clinical Neurology, 1994, Ch44, pp105-115)
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