====== 1816 ====== [[1815]]-[[1817]] [[Posttraumatic leptomeningeal cyst]]s were first described in [[1816]], ((Britz GW, Kim K, Mayberg MR. Traumatic [[Leptomeningeal Cyst]] in an [[Adult]]: A [[Case Report]] and [[Review]] of the [[Literature]]. Surg Neurol. 1998; 50: 465–469)).