title: Epidermal cyst of the breast mimicking malignancy: clinical, radiological, and histological correlation.
abstract: BACKGROUND
  Epidermal cyst of the breast is a rare benign intramammary lesion; however, a common finding in other parts of the body and most often located in the scalp, back, and neck. Only a few cases of epidermal cysts of the breast have been reported in literature.
  
  
  METHODS
  The patient presented with a small movable left breast lump. Mammography and ultrasonography did not show features of a benign lesion. Ultrasound-guided core biopsy was undertaken. Histology showed an epidermal cyst. The patient returned with an inflammation at the puncture site and a small abscess seen on ultrasound. The abscess was removed surgically.
  
  
  CONCLUSIONS
  Mammographic and sonographic features of an epidermal cyst may mimick a malignant lesion. Biopsy can result in complications, such as inflammation. In addition, an association between epidermal cyst and squamous carcinoma has been reported. Therefore, it is recommended that these lesions are resected.
authors.affiliation: Department of Radiology, University of Luebeck, Ratzeburger Allee 160, 23538, Luebeck, Germany, stoeckel@medinf.mu-luebeck.de.
authors.forename: Claudia U
authors.initials: CU
authors.lastname: Bergmann-Koester
authors.forename: Hans C
authors.initials: HC
authors.lastname: Kolberg
authors.forename: Isabel
authors.initials: I
authors.lastname: Rudolf
authors.forename: Stefan
authors.initials: S
authors.lastname: Krueger
authors.forename: Joerg
authors.initials: J
authors.lastname: Gellissen
authors.forename: Beate M
authors.initials: BM
authors.lastname: Stoeckelhuber
mesh_terms: D001706:Biopsy; D001943:Breast Neoplasms; D003937:Diagnosis, Differential; D004814:Epidermal Cyst / Q000000981:diagnostic imaging* / Q000473:pathology*; D005260:Female; D006801:Humans; D008327:Mammography; D008875:Middle Aged; D014463:Ultrasonography