Diagnostic Pathology BioMed Central Case Report Open Access Cylindroma of the breast: a case report and review of the literature Amr Mahmoud*1, David H Hill2, Martin J O'Sullivan2 and Michael W Bennett1 Address: 1BreastCheck, National Cancer Screening Service/Mercy University Hospital, Cork, Ireland and 2BreastCheck, National Cancer Screening Service/South Infirmary Victoria University Hospital, Cork, Ireland Email: Amr Mahmoud* -
[email protected]; David H Hill -
[email protected]; Martin J O'Sullivan -
[email protected]; Michael W Bennett -
[email protected] * Corresponding author Published: 2 September 2009 Received: 25 April 2009 Accepted: 2 September 2009 Diagnostic Pathology 2009, 4:30 doi:10.1186/1746-1596-4-30 This article is available from: http://www.diagnosticpathology.org/content/4/1/30 © 2009 Mahmoud et al; licensee BioMed Central Ltd. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. Abstract Cylindroma of the breast is a very rare lesion which is morphological and immunophenotypically identical to benign dermal cylindroma. We report a breast cylindroma in a previously healthy 62 year old female detected through a national breast screening program. The patient had no significant family or past medical history, and specifically no history of breast or skin diseases. The tumor consisted of well circumscribed islands of epithelial cells surrounded by a dense membrane material, and focally containing hyaline globules. At low power the islands of tumour cells formed a "jig-saw" pattern, which is typical of cylindroma, but was present within normal breast parenchyma and no had direct connection with the overlying skin.