title: Rare frontal lobe intraparenchymal epidermoid cyst with atypical imaging.
abstract: Epidermoid cysts are slow-growing benign tumors derived from ectodermal tissue that are hypothesized to have been inwardly displaced from the ectodermal surfaces during embryologic development. These cysts represent 1% to 2% of all intracranial tumors, and occur most commonly in the cerebellopontine angle, parasellar region, and subarachnoid spaces of the basal cisterns. Epidermoid cysts that are exclusively intraparenchymal are very rare, and can be difficult to diagnose as they often do not have classic radiologic findings, and share many similar radiologic features to other tumors such as astrocytomas, arachnoid cysts, dermoid cysts, and cavernomas. The authors present a patient with a rare intraparenchymal epidermoid cyst of the frontal lobe with atypical imaging features.
authors.affiliation: Division of Neuroradiology, Department of Medical Imaging, Faculty of Medicine, University of Toronto, Toronto, Canada.
authors.forename: Kevin
authors.initials: K
authors.lastname: Lian
authors.forename: Michael L
authors.initials: ML
authors.lastname: Schwartz
authors.forename: Juan
authors.initials: J
authors.lastname: Bilbao
authors.forename: James
authors.initials: J
authors.lastname: Perry
authors.forename: Richard I
authors.initials: RI
authors.lastname: Aviv
authors.forename: Sean P
authors.initials: SP
authors.lastname: Symons
mesh_terms: D001932:Brain Neoplasms / Q000175:diagnosis*; D056324:Diffusion Tensor Imaging; D004814:Epidermal Cyst / Q000175:diagnosis*; D005625:Frontal Lobe / Q000000981:diagnostic imaging / Q000473:pathology*; D006801:Humans; D008279:Magnetic Resonance Imaging; D008297:Male; D008875:Middle Aged; D011859:Radiography; D015898:Tomography Scanners, X-Ray Computed