EIC: Subset of EC from deep implantation of squamous epithelium often from injury (including iatrogenic)
Definitions
Common benign lesion of cutis and subcutis that arises from obstruction of hair follicle (EC) or ectopic implantation of epidermis (EIC)
IMAGING
General Features
Radiographic Findings
CT Findings
MR Findings
Ultrasonographic Findings
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
Selected References
Hoang VT et al: Overview of epidermoid cyst. Eur J Radiol Open. 6:291-301, 2019
Clarke R et al: Twinkle artefact in the ultrasound diagnosis of superficial epidermoid cysts. Ultrasound. 24(3):147-53, 2016
Feng CJ et al: Treatment of epidermal cysts with erbium: YAG laser fenestration: an alternative to surgical intervention. Ann Plast Surg. 74 Suppl 2:S89-92, 2015
Melamud K et al: Diagnostic imaging of benign and malignant osseous tumors of the fingers. Radiographics. 34(7):1954-67, 2014
Hwang DY et al: Multiple huge epidermal inclusion cysts mistaken as neurofibromatosis. J Craniofac Surg. 19(6):1683-6, 2008
Takemura N et al: Fluid-fluid level in a giant epidermal cyst of the buttock. J Dermatol. 34(3):193-7, 2007
Golshan Momeni M et al: Giant epidermal inclusion cyst of buttock. Skeletal Radiol. 35(11):864-6, 2006
Kransdorf MJ et al: Masses that may mimic soft tissue tumors. In Kransdorf MJ et al: Imaging of Soft Tissue Tumors. 2nd ed. Lippincott Williams & Wilkins. 560-1, 2006
Patel K et al: Epidermal inclusion cyst of phalanx: a case report and review of the literature. Skeletal Radiol. 35(11):861-3, 2006
Shibata T et al: Magnetic resonance imaging features of epidermoid cyst in the extremities. Arch Orthop Trauma Surg. 123(5):239-41, 2003
Baredes S et al: Radiology quiz case. Epidermal inclusion cyst with intracystic keratin debris. Arch Otolaryngol Head Neck Surg. 128(6):723-4, 2002
Fisher AR et al: Ruptured plantar epidermal inclusion cyst. AJR Am J Roentgenol. 171(6):1709-10, 1998
Fujimoto H et al: Large epidermal cyst involving the ischiorectal fossa: MR demonstration. Clin Imaging. 17(2):146-8, 1993
EIC: Subset of EC from deep implantation of squamous epithelium often from injury (including iatrogenic)
Definitions
Common benign lesion of cutis and subcutis that arises from obstruction of hair follicle (EC) or ectopic implantation of epidermis (EIC)
IMAGING
General Features
Radiographic Findings
CT Findings
MR Findings
Ultrasonographic Findings
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
Selected References
Hoang VT et al: Overview of epidermoid cyst. Eur J Radiol Open. 6:291-301, 2019
Clarke R et al: Twinkle artefact in the ultrasound diagnosis of superficial epidermoid cysts. Ultrasound. 24(3):147-53, 2016
Feng CJ et al: Treatment of epidermal cysts with erbium: YAG laser fenestration: an alternative to surgical intervention. Ann Plast Surg. 74 Suppl 2:S89-92, 2015
Melamud K et al: Diagnostic imaging of benign and malignant osseous tumors of the fingers. Radiographics. 34(7):1954-67, 2014
Hwang DY et al: Multiple huge epidermal inclusion cysts mistaken as neurofibromatosis. J Craniofac Surg. 19(6):1683-6, 2008
Takemura N et al: Fluid-fluid level in a giant epidermal cyst of the buttock. J Dermatol. 34(3):193-7, 2007
Golshan Momeni M et al: Giant epidermal inclusion cyst of buttock. Skeletal Radiol. 35(11):864-6, 2006
Kransdorf MJ et al: Masses that may mimic soft tissue tumors. In Kransdorf MJ et al: Imaging of Soft Tissue Tumors. 2nd ed. Lippincott Williams & Wilkins. 560-1, 2006
Patel K et al: Epidermal inclusion cyst of phalanx: a case report and review of the literature. Skeletal Radiol. 35(11):861-3, 2006
Shibata T et al: Magnetic resonance imaging features of epidermoid cyst in the extremities. Arch Orthop Trauma Surg. 123(5):239-41, 2003
Baredes S et al: Radiology quiz case. Epidermal inclusion cyst with intracystic keratin debris. Arch Otolaryngol Head Neck Surg. 128(6):723-4, 2002
Fisher AR et al: Ruptured plantar epidermal inclusion cyst. AJR Am J Roentgenol. 171(6):1709-10, 1998
Fujimoto H et al: Large epidermal cyst involving the ischiorectal fossa: MR demonstration. Clin Imaging. 17(2):146-8, 1993
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