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Epidermal (Sebaceous) Cyst
Michael P. Federle, MD, FACR
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KEY FACTS

  • Terminology

    • Imaging

      • Diagnostic Checklist

        TERMINOLOGY

        • Synonyms

          • Infundibular cyst, sebaceous cyst, epidermoid cyst
        • Definitions

          • Benign cyst originating in dermis lined with infundibular or epidermal-like cells that keratinize
            • "Sebaceous cyst" is misnomer and should be avoided
              • Cysts are not of sebaceous differentiation and imaging characteristics vary according to contents

        IMAGING

        • General Features

          • Imaging Recommendations

            • CT Findings

              • MR Findings

                • Ultrasonographic Findings

                  DIFFERENTIAL DIAGNOSIS

                    PATHOLOGY

                    • General Features

                      • Gross Pathologic & Surgical Features

                        CLINICAL ISSUES

                        • Presentation

                          • Demographics

                            • Natural History & Prognosis

                              • Treatment

                                DIAGNOSTIC CHECKLIST

                                • Consider

                                  Selected References

                                  1. Datir A et al: MRI of soft-tissue masses: the relationship between lesion size, depth, and diagnosis. Clin Radiol. 63(4):373-8; discussion 379-80, 2008
                                  2. Beaman FD et al: Superficial soft-tissue masses: analysis, diagnosis, and differential considerations. Radiographics. 27(2):509-23, 2007
                                  3. Blacksin MF et al: Superficial soft-tissue masses of the extremities. Radiographics. 26(5):1289-304, 2006
                                  4. Harish S et al: Soft tissue masses with "cyst-like" appearance on MR imaging: Distinction of benign and malignant lesions. Eur Radiol. 16(12):2652-60, 2006
                                  5. Kocaoglu M et al: Pediatric presacral masses. Radiographics. 26(3):833-57, 2006
                                  6. Laor T: MR imaging of soft tissue tumors and tumor-like lesions. Pediatr Radiol. 34(1):24-37, 2004
                                  7. Fenstermacher MJ: Imaging evaluation of patients with soft tissue sarcoma. Surg Oncol Clin N Am. 12(2):305-32, 2003
                                  8. Galant J et al: Grading of subcutaneous soft tissue tumors by means of their relationship with the superficial fascia on MR imaging. Skeletal Radiol. 27(12):657-63, 1998
                                  Related Anatomy
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                                  Related Differential Diagnoses
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                                  References
                                  Tables

                                  Tables

                                  KEY FACTS

                                  • Terminology

                                    • Imaging

                                      • Diagnostic Checklist

                                        TERMINOLOGY

                                        • Synonyms

                                          • Infundibular cyst, sebaceous cyst, epidermoid cyst
                                        • Definitions

                                          • Benign cyst originating in dermis lined with infundibular or epidermal-like cells that keratinize
                                            • "Sebaceous cyst" is misnomer and should be avoided
                                              • Cysts are not of sebaceous differentiation and imaging characteristics vary according to contents

                                        IMAGING

                                        • General Features

                                          • Imaging Recommendations

                                            • CT Findings

                                              • MR Findings

                                                • Ultrasonographic Findings

                                                  DIFFERENTIAL DIAGNOSIS

                                                    PATHOLOGY

                                                    • General Features

                                                      • Gross Pathologic & Surgical Features

                                                        CLINICAL ISSUES

                                                        • Presentation

                                                          • Demographics

                                                            • Natural History & Prognosis

                                                              • Treatment

                                                                DIAGNOSTIC CHECKLIST

                                                                • Consider

                                                                  Selected References

                                                                  1. Datir A et al: MRI of soft-tissue masses: the relationship between lesion size, depth, and diagnosis. Clin Radiol. 63(4):373-8; discussion 379-80, 2008
                                                                  2. Beaman FD et al: Superficial soft-tissue masses: analysis, diagnosis, and differential considerations. Radiographics. 27(2):509-23, 2007
                                                                  3. Blacksin MF et al: Superficial soft-tissue masses of the extremities. Radiographics. 26(5):1289-304, 2006
                                                                  4. Harish S et al: Soft tissue masses with "cyst-like" appearance on MR imaging: Distinction of benign and malignant lesions. Eur Radiol. 16(12):2652-60, 2006
                                                                  5. Kocaoglu M et al: Pediatric presacral masses. Radiographics. 26(3):833-57, 2006
                                                                  6. Laor T: MR imaging of soft tissue tumors and tumor-like lesions. Pediatr Radiol. 34(1):24-37, 2004
                                                                  7. Fenstermacher MJ: Imaging evaluation of patients with soft tissue sarcoma. Surg Oncol Clin N Am. 12(2):305-32, 2003
                                                                  8. Galant J et al: Grading of subcutaneous soft tissue tumors by means of their relationship with the superficial fascia on MR imaging. Skeletal Radiol. 27(12):657-63, 1998