Interhemispheric arachnoid cyst [Neurosurgery Wiki]

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=====Interhemispheric arachnoid cyst=====
Noncommunicating interhemispheric [[cyst]]s, such as [[interhemispheric arachnoid cyst]] or [[ependymal cyst]], with callosal agenesis are also in the second category. A careful review of embryologic development is essential for understanding these midline cysts and for making a more accurate radiologic diagnosis
((Utsunomiya H, Yamashita S, Takano K, Ueda Y, Fujii A. Midline cystic
malformations of the brain: imaging diagnosis and classification based on
embryologic analysis. Radiat Med. 2006 Jul;24(6):471-81. Review. PubMed PMID:
16958432.
)).

====Case series====
Two cases of symptomatic interhemispheric [[arachnoid cyst]] (IHAC) in the elderly, both extending into the frontoparietal region. Both patients presented with more than an 8-year history of progressive [[hemiparesis]] and underwent capsule resection in combination with internal drainage to the [[pericallosal cistern]] via the [[interhemispheric approach]]. Postoperatively, the cyst cavities were greatly reduced in size, and neurologic signs and symptoms were markedly improved
((Watanabe M, Kameyama S, Takeda N, Tanaka R. Two cases of symptomatic
interhemispheric arachnoid cyst in the elderly. Surg Neurol. 1994
Oct;42(4):346-51. Review. PubMed PMID: 7974135.)).