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

• Published in: Journal of cutaneous pathology Vol. 39; no. 8; pp. 798 - 802
• Main Authors: Val‐Bernal, José Fernando, González‐Vela, María Carmen, De Grado, Mauricio, Garijo, María Francisca
• Format: Journal Article
• Language: English
• Published: Oxford, UK Blackwell Publishing Ltd 01.08.2012
• Subjects: Accessory breast; Adult; Angiomatosis - diagnosis; Axilla - pathology; Breast; Breast Diseases - diagnosis; Breast Neoplasms - metabolism; Breast Neoplasms - pathology; Breast Neoplasms - surgery; Choristoma - metabolism; Choristoma - pathology; Choristoma - surgery; Collagen - metabolism; Cowden's syndrome; Diagnosis, Differential; Female; Fibroadenoma; Fibroadenoma - metabolism; Fibroadenoma - pathology; Fibroadenoma - surgery; Fibrocystic Breast Disease - diagnosis; Fibroma - metabolism; Fibroma - pathology; Fibroma - surgery; Hamartoma Syndrome, Multiple - diagnosis; Humans; Hyperplasia - diagnosis; Nerve Sheath Neoplasms - diagnosis; Perineurioma; Sclerosis; Sclerotic fibroma; Stromal Cells - metabolism; Stromal Cells - pathology
• ISSN: 0303-6987; 1600-0560
• DOI: 10.1111/j.1600-0560.2012.01940.x

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.