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Sebaceous Cyst
Anne G. Osborn, MD, FACR
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KEY FACTS

  • Terminology

    • Imaging

      • Top Differential Diagnoses

        • Clinical Issues

          TERMINOLOGY

          • Abbreviations

            • Trichilemmal cyst (TC) is preferred terminology
              • Sebaceous cyst (SC) commonly used but incorrect
            • Variant = proliferating trichilemmal tumor (PTT)
          • Synonyms

            • PTT also called "pilar" or "turban" tumor
          • Definitions

            • Keratin-containing cyst
              • Lined by stratified squamous epithelium

          IMAGING

          • General Features

            • Imaging Recommendations

              • CT Findings

                • MR Findings

                  DIFFERENTIAL DIAGNOSIS

                    PATHOLOGY

                    • General Features

                      • Gross Pathologic & Surgical Features

                        • Microscopic Features

                          CLINICAL ISSUES

                          • Presentation

                            • Demographics

                              • Natural History & Prognosis

                                • Treatment

                                  Selected References

                                  1. Abdou AG: Cytologic findings of proliferating trichilemmal tumor (PTT) of scalp. Diagn Cytopathol. 48(1):86-9, 2020
                                  2. Strait AM et al: Proliferating pilar tumor: a rare cutaneous entity mimicking breast malignancy on imaging. Breast J. ePub, 2020
                                  3. Wollina U et al: Squamous cell carcinoma associated with trichilemmal cyst: a rare collision tumor. Dermatol Ther. e13260, 2020
                                  4. Adegun OK et al: Proliferating trichilemmal tumour: diagnostic challenge on core biopsy. BMJ Case Rep. 12(2), 2019
                                  5. Friedrich RE et al: Multiple trichilemmal cysts of the scalp. Anticancer Res. 39(8):4253-8, 2019
                                  6. He P et al: Trichilemmal cyst: clinical and sonographic features. J Ultrasound Med. 38(1):91-6, 2019
                                  7. Kawaguchi M et al: CT and MRI features of scalp lesions. Radiol Med. 124(10):1049-61, 2019
                                  Related Anatomy
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                                  Related Differential Diagnoses
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                                  References
                                  Tables

                                  Tables

                                  KEY FACTS

                                  • Terminology

                                    • Imaging

                                      • Top Differential Diagnoses

                                        • Clinical Issues

                                          TERMINOLOGY

                                          • Abbreviations

                                            • Trichilemmal cyst (TC) is preferred terminology
                                              • Sebaceous cyst (SC) commonly used but incorrect
                                            • Variant = proliferating trichilemmal tumor (PTT)
                                          • Synonyms

                                            • PTT also called "pilar" or "turban" tumor
                                          • Definitions

                                            • Keratin-containing cyst
                                              • Lined by stratified squamous epithelium

                                          IMAGING

                                          • General Features

                                            • Imaging Recommendations

                                              • CT Findings

                                                • MR Findings

                                                  DIFFERENTIAL DIAGNOSIS

                                                    PATHOLOGY

                                                    • General Features

                                                      • Gross Pathologic & Surgical Features

                                                        • Microscopic Features

                                                          CLINICAL ISSUES

                                                          • Presentation

                                                            • Demographics

                                                              • Natural History & Prognosis

                                                                • Treatment

                                                                  Selected References

                                                                  1. Abdou AG: Cytologic findings of proliferating trichilemmal tumor (PTT) of scalp. Diagn Cytopathol. 48(1):86-9, 2020
                                                                  2. Strait AM et al: Proliferating pilar tumor: a rare cutaneous entity mimicking breast malignancy on imaging. Breast J. ePub, 2020
                                                                  3. Wollina U et al: Squamous cell carcinoma associated with trichilemmal cyst: a rare collision tumor. Dermatol Ther. e13260, 2020
                                                                  4. Adegun OK et al: Proliferating trichilemmal tumour: diagnostic challenge on core biopsy. BMJ Case Rep. 12(2), 2019
                                                                  5. Friedrich RE et al: Multiple trichilemmal cysts of the scalp. Anticancer Res. 39(8):4253-8, 2019
                                                                  6. He P et al: Trichilemmal cyst: clinical and sonographic features. J Ultrasound Med. 38(1):91-6, 2019
                                                                  7. Kawaguchi M et al: CT and MRI features of scalp lesions. Radiol Med. 124(10):1049-61, 2019