# Nontraumatic intra-diploic arachnoid cyst communicating with sphenoid bone and in close proximity to cavernous sinus in a known case of Wilson disease: A rare entity

## TL;DR

This case report describes a rare nontraumatic arachnoid cyst in a patient with Wilson disease, located near the sphenoid bone and cavernous sinus.

## Contribution

The paper presents a rare case of nontraumatic intra-diploic arachnoid cyst in a Wilson disease patient.

## Key findings

- The cyst communicated with the greater wing of the sphenoid bone.
- The case highlights the need for better understanding of such rare cystic lesions.
- Wilson disease may be associated with unusual arachnoid cyst development.

## Abstract

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. We present a case of an intra-diploic arachnoid cyst communicating with the greater wing of the sphenoid and in close proximity to the cavernous sinus in a known case of Wilson disease for 22 years. Due to its low incidence, there is a gap in the knowledge and discussion of this cystic lesion, its pathophysiology and management, which are discussed in this case report.