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Case Reports in Radiology
Volume 2015, Article ID 528632, 4 pages
http://dx.doi.org/10.1155/2015/528632
Case Report

Atypical Intracranial Epidermoid Cysts: Rare Anomalies with Unique Radiological Features

1Department of Imaging & Interventional Radiology, Prince of Wales Hospital, The Chinese University of Hong Kong, Shatin, Hong Kong
2Department of Radiology, Kwong Wah Hospital, Kowloon, Hong Kong
3Department of Anatomical & Cellular Pathology, Prince of Wales Hospital, The Chinese University of Hong Kong, Shatin, Hong Kong

Received 12 August 2014; Accepted 26 December 2014

Academic Editor: Yoshito Tsushima

Copyright © 2015 Eric K. C. Law et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Epidermoid cysts are benign slow growing extra-axial tumours that insinuate between brain structures, while their occurrences in intra-axial or intradiploic locations are exceptionally rare. We present the clinical, imaging, and pathological findings in two patients with atypical epidermoid cysts. CT and MRI findings for the first case revealed an intraparenchymal epidermoid cyst that demonstrated no restricted diffusion. The second case demonstrated an aggressive epidermoid cyst that invaded into the intradiploic spaces, transverse sinus, and the calvarium. The timing of ectodermal tissue sequestration during fetal development may account for the occurrence of atypical epidermoid cysts.