Arachnoid cysts can be intra-cranial or along the spinal cord. Intracranial arachnoid cyst is a very rare finding. trauma being the leading case of it. It is extremely rare for the development of intra-diploic arachnoid cyst without a traumatic history. https://www.roneverhart.com/Craggy-Range-Sauvignon-Blanc-Te-Muna-Road-Vineyard-Martinborough-2022/