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Sclerotic fibroma (storiform collagenoma)-like stroma in a fibroadenoma of axillary accessory breast tissue

Authors

  • José Fernando Val-Bernal,

    Corresponding author
    • Anatomical Pathology Department, Marqués de Valdecilla, University Hospital, Medical Faculty, University of Cantabria and IFIMAV, Santander, Spain
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  • María Carmen González-Vela,

    1. Anatomical Pathology Department, Marqués de Valdecilla, University Hospital, Medical Faculty, University of Cantabria and IFIMAV, Santander, Spain
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  • Mauricio De Grado,

    1. Ambulatory Surgical Unit, Marqués de Valdecilla, University Hospital, Santander, Spain
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  • María Francisca Garijo

    1. Anatomical Pathology Department, Marqués de Valdecilla, University Hospital, Medical Faculty, University of Cantabria and IFIMAV, Santander, Spain
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José Fernando Val-Bernal

Facultad de Medicina, Universidad de Cantabria, Avda. Cardenal Herrera Oria s/n 39011 Santander, Spain

Tel: +34 942 202599

Fax: +34 942 203492

e-mail: apavbj@humv.es

Abstract

Accessory breast tissue is a subcutaneous remnant persisting after normal embryological development of the breast. It occurs most frequently in the axilla. Fibroadenomas in axillary breast tissue are rare. We report the case of a 29-year-old female patient who presented a fibroadenoma arising in the accessory breast tissue of the right axillary fossa. The neoplasm showed foci of sclerotic fibroma-like stroma. The patient had no signs of Cowden's syndrome. To the best of our knowledge, a lesion of this kind has not been previously reported. This stromal change suggests an uncommon involutional phase of the fibroadenoma with production of sclerotic and hypocellular collagen. The lesion should be differentiated from extraneural perineuroma, from the changes in fibroadenomas in Cowden's syndrome, from sclerosing lobular hyperplasia (fibroadenomatoid mastopathy) and from pseudoangiomatous stromal hyperplasia.

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