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Introduction: Synchronous bilateral breast cancer (SBBC) is rare, comprising 2-5% of all breast cancer cases. Even more uncommon is the presence of discordant histologies in each breast. This report discusses a case involving invasive ductal carcinoma (IDC) in the left breast and invasive lobular carcinoma (ILC) in the right breast. Case Presentation: A 46-year-old Arab woman presented with a 6-month history of a growing lump in the left breast and a newly noticed nodule in the right breast. Imaging and biopsy confirmed IDC (Grade 2, ER+/PR+/HER2-) in the left breast and ILC with LCIS in the right breast. Bilateral axillary lymphadenopathy was observed. She underwent neoadjuvant chemotherapy (doxorubicin/cyclophosphamide followed by paclitaxel), followed by a left radical mastectomy with axillary dissection. Hormonal therapy (goserelin and exemestane) and adjuvant radiotherapy were initiated. Right-breast surgery is pending. Conclusion: SBBC with discordant histology necessitates a multidisciplinary, individualized treatment approach. Hormone receptor status, tumor biology, and extent of disease all influence treatment decisions. This rare clinical scenario highlights the need for further research and specific management guidelines.
Al‐Bitar et al. (Thu,) studied this question.
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