INI-CET 2014 — Surgery

Question 1: A 17-year-old female underwent Fine Needle Aspiration cytology (FNAC) for a lump in the breast which was non-tender, firm and mobile. Which of the following features would suggest a benign breast disease?

• A. Dyscohesive ductal epithelial cells without cellular fragments
• B. Tightly arranged ductal epithelial cells with dyscohesive bare nuclei (Correct Answer)
• C. Stromal predominance with spindle cells
• D. Polymorphism with single or arranged ductal epithelial cells

Explanation: ### **Explanation** The clinical presentation of a 17-year-old female with a firm, non-tender, and highly mobile breast lump (the "breast mouse") is classic for a **Fibroadenoma**, the most common benign breast tumor in young women. **Why Option B is Correct:** The cytological hallmark of benign breast lesions, particularly fibroadenomas, is the presence of **bipolar bare nuclei** (also called "naked nuclei") scattered in the background. These represent myoepithelial cells that have been stripped of their cytoplasm. Their presence is a strong indicator of benignity. Additionally, benign lesions show **tightly cohesive clusters** of ductal epithelial cells, often arranged in "antler-like" or "staghorn" patterns. **Analysis of Incorrect Options:** * **Option A:** **Dyscohesive** ductal cells (cells falling apart) are a hallmark of **malignancy** (e.g., Ductal Carcinoma). In cancer, cells lose their adhesion molecules (like E-cadherin), leading to a scattered, non-cohesive appearance. * **Option C:** While fibroadenomas have a stromal component, "stromal predominance with spindle cells" is more characteristic of a **Phyllodes tumor**, which requires differentiation from a simple fibroadenoma due to its potential for rapid growth and recurrence. * **Option D:** **Polymorphism** (variation in size and shape) and single epithelial cells are features of **cellular atypia and malignancy**. Benign cells are typically monomorphic (uniform). ### **High-Yield Clinical Pearls for NEET-PG** * **Triple Assessment:** Clinical examination + Imaging (Ultrasound for <30y, Mammography for >30y) + Pathology (FNAC/Core Biopsy). * **FNAC vs. Core Biopsy:** FNAC is excellent for identifying bare nuclei (benignity), but Core Biopsy is preferred if malignancy is suspected to assess invasiveness and receptor status (ER/PR/Her2neu). * **The "Breast Mouse":** A term used for Fibroadenoma due to its extreme mobility within the breast tissue. * **Cytology Rule:** The presence of **myoepithelial cells** (bare nuclei) virtually excludes a diagnosis of invasive breast cancer.