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KEY FACTS
Terminology
Imaging
Top Differential Diagnoses
Pathology
Clinical Issues
TERMINOLOGY
Synonyms
Epidermoid tumor, primary cholesteatoma, or epithelial inclusion cyst
Definitions
Congenital inclusion of ectodermal epithelial elements during neural tube closure
IMAGING
General Features
CT Findings
MR Findings
Imaging Recommendations
DIFFERENTIAL DIAGNOSIS
PATHOLOGY
General Features
Gross Pathologic & Surgical Features
Microscopic Features
CLINICAL ISSUES
Presentation
Demographics
Natural History & Prognosis
Treatment
DIAGNOSTIC CHECKLIST
Consider
Image Interpretation Pearls
Reporting Tips
Selected References
Gopalakrishnan CV et al: Long term outcome in surgically treated posterior fossa epidermoids. Clin Neurol Neurosurg. 117:93-9, 2014
Jolapara M et al: Diffusion tensor mode in imaging of intracranial epidermoid cysts: one step ahead of fractional anisotropy. Neuroradiology. 51(2):123-9, 2009
Schiefer TK et al: Epidermoids of the cerebellopontine angle: a 20-year experience. Surg Neurol. 70(6):584-90; discussion 590, 2008
Ben Hamouda M et al: Atypical CT and MRI aspects of an epidermoid cyst. J Neuroradiol. 34(2):129-32, 2007
Bonneville F et al: Imaging of cerebellopontine angle lesions: an update. Part 2: intra-axial lesions, skull base lesions that may invade the CPA region, and non-enhancing extra-axial lesions. Eur Radiol. 17(11):2908-20, 2007
Osborn AG et al: Intracranial cysts: radiologic-pathologic correlation and imaging approach. Radiology. 239(3):650-64, 2006
Liu P et al: MR imaging of epidermoids at the cerebellopontine angle. Magn Reson Med Sci. 2(3):109-15, 2003
Dutt SN et al: Radiologic differentiation of intracranial epidermoids from arachnoid cysts. Otol Neurotol. 23(1):84-92, 2002
Kobata H et al: Cerebellopontine angle epidermoids presenting with cranial nerve hyperactive dysfunction: pathogenesis and long-term surgical results in 30 patients. Neurosurgery. 50(2):276-85; discussion 285-6, 2002
Dechambre S et al: Diffusion-weighted MRI postoperative assessment of an epidermoid tumour in the cerebellopontine angle. Neuroradiology. 41(11):829-31, 1999
Ochi M et al: Unusual CT and MR appearance of an epidermoid tumor of the cerebellopontine angle. AJNR Am J Neuroradiol. 19(6):1113-5, 1998
Talacchi A et al: Assessment and surgical management of posterior fossa epidermoid tumors: report of 28 cases. Neurosurgery. 42(2):242-51; discussion 251-2, 1998
Timmer FA et al: Chemical analysis of an epidermoid cyst with unusual CT and MR characteristics. AJNR Am J Neuroradiol. 19(6):1111-2, 1998
Ikushima I et al: MR of epidermoids with a variety of pulse sequences. AJNR Am J Neuroradiol. 18(7):1359-63, 1997
Kallmes DF et al: Typical and atypical MR imaging features of intracranial epidermoid tumors. AJR Am J Roentgenol. 169(3):883-7, 1997
Tien RD et al: Variable bandwidth steady-state free-precession MR imaging: a technique for improving characterization of epidermoid tumor and arachnoid cyst. AJR Am J Roentgenol. 164(3):689-92, 1995
Gao PY et al: Radiologic-pathologic correlation. Epidermoid tumor of the cerebellopontine angle. AJNR Am J Neuroradiol. 13(3):863-72, 1992
Tsuruda JS et al: Diffusion-weighted MR imaging of the brain: value of differentiating between extraaxial cysts and epidermoid tumors. AJNR Am J Neuroradiol. 11(5):925-31; discussion 932-4, 1990
Tampieri D et al: MR imaging of epidermoid cysts. AJNR Am J Neuroradiol. 10(2):351-6, 1989
Related Anatomy
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Related Differential Diagnoses
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References
Tables
Tables
KEY FACTS
Terminology
Imaging
Top Differential Diagnoses
Pathology
Clinical Issues
TERMINOLOGY
Synonyms
Epidermoid tumor, primary cholesteatoma, or epithelial inclusion cyst
Definitions
Congenital inclusion of ectodermal epithelial elements during neural tube closure
IMAGING
General Features
CT Findings
MR Findings
Imaging Recommendations
DIFFERENTIAL DIAGNOSIS
PATHOLOGY
General Features
Gross Pathologic & Surgical Features
Microscopic Features
CLINICAL ISSUES
Presentation
Demographics
Natural History & Prognosis
Treatment
DIAGNOSTIC CHECKLIST
Consider
Image Interpretation Pearls
Reporting Tips
Selected References
Gopalakrishnan CV et al: Long term outcome in surgically treated posterior fossa epidermoids. Clin Neurol Neurosurg. 117:93-9, 2014
Jolapara M et al: Diffusion tensor mode in imaging of intracranial epidermoid cysts: one step ahead of fractional anisotropy. Neuroradiology. 51(2):123-9, 2009
Schiefer TK et al: Epidermoids of the cerebellopontine angle: a 20-year experience. Surg Neurol. 70(6):584-90; discussion 590, 2008
Ben Hamouda M et al: Atypical CT and MRI aspects of an epidermoid cyst. J Neuroradiol. 34(2):129-32, 2007
Bonneville F et al: Imaging of cerebellopontine angle lesions: an update. Part 2: intra-axial lesions, skull base lesions that may invade the CPA region, and non-enhancing extra-axial lesions. Eur Radiol. 17(11):2908-20, 2007
Osborn AG et al: Intracranial cysts: radiologic-pathologic correlation and imaging approach. Radiology. 239(3):650-64, 2006
Liu P et al: MR imaging of epidermoids at the cerebellopontine angle. Magn Reson Med Sci. 2(3):109-15, 2003
Dutt SN et al: Radiologic differentiation of intracranial epidermoids from arachnoid cysts. Otol Neurotol. 23(1):84-92, 2002
Kobata H et al: Cerebellopontine angle epidermoids presenting with cranial nerve hyperactive dysfunction: pathogenesis and long-term surgical results in 30 patients. Neurosurgery. 50(2):276-85; discussion 285-6, 2002
Dechambre S et al: Diffusion-weighted MRI postoperative assessment of an epidermoid tumour in the cerebellopontine angle. Neuroradiology. 41(11):829-31, 1999
Ochi M et al: Unusual CT and MR appearance of an epidermoid tumor of the cerebellopontine angle. AJNR Am J Neuroradiol. 19(6):1113-5, 1998
Talacchi A et al: Assessment and surgical management of posterior fossa epidermoid tumors: report of 28 cases. Neurosurgery. 42(2):242-51; discussion 251-2, 1998
Timmer FA et al: Chemical analysis of an epidermoid cyst with unusual CT and MR characteristics. AJNR Am J Neuroradiol. 19(6):1111-2, 1998
Ikushima I et al: MR of epidermoids with a variety of pulse sequences. AJNR Am J Neuroradiol. 18(7):1359-63, 1997
Kallmes DF et al: Typical and atypical MR imaging features of intracranial epidermoid tumors. AJR Am J Roentgenol. 169(3):883-7, 1997
Tien RD et al: Variable bandwidth steady-state free-precession MR imaging: a technique for improving characterization of epidermoid tumor and arachnoid cyst. AJR Am J Roentgenol. 164(3):689-92, 1995
Gao PY et al: Radiologic-pathologic correlation. Epidermoid tumor of the cerebellopontine angle. AJNR Am J Neuroradiol. 13(3):863-72, 1992
Tsuruda JS et al: Diffusion-weighted MR imaging of the brain: value of differentiating between extraaxial cysts and epidermoid tumors. AJNR Am J Neuroradiol. 11(5):925-31; discussion 932-4, 1990
Tampieri D et al: MR imaging of epidermoid cysts. AJNR Am J Neuroradiol. 10(2):351-6, 1989
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