Malignant Phyllodes Tumor in Ectopic Breast Tissue: A Case Report with a Literature Review
2018
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.
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