Abstract

Supernumerary breasts come from ectopic breast tissue which regression was incomplete. Typically, it is a single supernumerary gland, located in the axilla. Ectopic breast tissue is subject to the same pathologic events that occur in normally positioned breasts. Excision may be required for diagnosis, treatment of symptoms or cosmesis. We report a case report of a female patient aged 22 years, without medical history. She consulted for a left axillary swelling. Breast ultrasound showed: Voluminous mass of axillary tail with polylobed contours, Aspect evoking a phyllodes tumor. The patient had a wide excision. Anapath review concluded: Malignant phyllodes tumor in ectopic breast tissue and absence of residual tumor. Abdominal ultrasound and chest x-ray were normal. Adjuvant systemic treatment and radiotherapy were not delivered. Our patient is regularly followed: She doesn’t develop distant metastases or loco-regional relapse. Axillary ectopic breast tissue may provide a diagnostic challenge, as other benign and malignant lesions occur in this area. Malignant Phyllodes tumor in ectopic breast tissue is an extremely rare occurrence. Wide breast surgery is the mainstay of the treatment of non-metastatic malignant phyllodes tumors of the breast.

Highlights

  • IntroductionPolymastia (supernumerary breasts) is a congenital condition in which abnormal accessory breast tissue is found in addition to normal breast tissue

  • Polymastia is a congenital condition in which abnormal accessory breast tissue is found in addition to normal breast tissue

  • Pathological examination concluded to a malignant phyllode tumor in supernumerary breast

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Summary

Introduction

Polymastia (supernumerary breasts) is a congenital condition in which abnormal accessory breast tissue is found in addition to normal breast tissue. Patients may be misdiagnosed prenatally as having a lipoma, lymphadenopathy, or hidradenitis suppurativa [2]. This is ectopic breast tissue is the seat of the same pathologic events that occur in normally located breast tissue, both benign and malignant [3,4]. Pathological examination concluded to a malignant phyllode tumor in supernumerary breast. A 22-year-old woman presented with no medical history She consulted for the appearance of a left axillary mass in the last eight days. Extensive surgical excision was performed, and the pathological examination concluded that there was a malignant phyllode tumor on ectopic breast.

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