Affiliations: Department of Radiology, Cumhuriyet University School
of Medicine, Sivas, Turkiye | Department of Radiology, Ege University School of
Medicine, Izmir, Turkiye | Department of Pediatrics, Division of Pediatric
Neurology, Cumhuriyet University School of Medicine, Sivas, Turkiye
Note: [] Correspondence: Dr. Mehmet H. Atalar, Department of Radiology,
Cumhuriyet University School of Medicine, 58140, Sivas, Turkiye. Tel.: +90 346
219 13 00; Fax: +90 346 219 12 84; E-mail: [email protected]
Abstract: Intracranial epidermoid cysts can closely mimic cerebrospinal fluid
on magnetic resonance imaging and computed tomography. Epidermoid cysts are
isointense to slightly hyperintense relative to cerebrospinal fluid on
T_{1}-, T_{2}-, and proton
density-weighted images. It is difficult to discern the exact extension of an
epidermoid cyst with only T_{1}-, T_{2}-,
or proton density-weighted imaging. In this exhibit, we present a case of
intracranial epidermoid cyst, which closely mimicked an arachnoid cyst on
routine magnetic resonance sequences. In the present case, we performed the
constructive interference in steady-state (CISS) sequence and
diffusion-weighted imaging. The CISS sequence depicted the epidermoid cyst as
hypointense relative to cerebrospinal fluid and was considered to show the
epidermoid cyst extension better than other routine sequences. The epidermoid
cyst has typical high signal intensity on the diffusion-weighted images
associated with low apparent diffusion coefficient values.
Keywords: Magnetic resonance imaging, diffusion-weighted imaging, epidermoid cyst
