Unrelated: Head shape is unrelated to arachnoid cyst. Skull shape is created by sutures between cranial bones. Premature closure of metopic suture- in forehead area can create a cone or triangular shaped head. More about arachnoid cysts https://rarediseases.org/rare-diseases/arachnoid-cysts/ More about skull shape craniosynostosis http://www.childrenshospital.org/conditions-and-treatments/conditions/metopic-synostosis-trigonocephaly
Answered 2/11/2017
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