Fibroadenoma and phyllodes tumor diagnosed in contralateral breasts: a rare case report

Abstract

Introduction: Fibroadenomas and phyllodes tumors are fibroepithelial lesions of the breast that differ significantly in their clinical behavior, prognosis, and management. While fibroadenomas are common benign tumors in young women, phyllodes tumors are rare and can range from benign to malignant with a potential for local recurrence and distant metastasis. The coexistence of both these lesions in contralateral breasts is exceptionally rare and poses diagnostic and therapeutic challenges.

Case presentation: We report a case of a 32-year-old premenopausal woman who presented with bilateral breast lumps, which upon excision and histopathological evaluation were confirmed to be a fibroadenoma in the right breast and a benign phyllodes tumor in the left breast.

Discussion: Though both fibroadenoma and phyllodes tumor originate from the terminal duct-lobular unit and share overlapping clinical and radiological features, they differ significantly in their natural history and management. The co-existence of these two entities in separate breasts may be incidental or suggest a common underlying stromal predisposition.

Conclusion: This report highlights the importance of careful clinical, radiological, and pathological correlation in distinguishing between these two entities and tailoring appropriate treatment strategies.