Epidermal cyst of the breast mimicking malignancy: clinical, radiological, and histological correlation.
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.
Bergmann-Koester
Claudia U
CU
Department of Radiology, University of Luebeck, Ratzeburger Allee 160, 23538, Luebeck, Germany, stoeckel@medinf.mu-luebeck.de.
Kolberg
Hans C
HC
Rudolf
Isabel
I
Krueger
Stefan
S
Gellissen
Joerg
J
Stoeckelhuber
Beate M
BM
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