Ductal Carcinoma in Situ (Breast)

Ductal Carcinoma in Situ (DCIS) is a type of breast condition where abnormal cells grow inside the milk ducts but have not spread outside them. It affects the breast tissue and is considered a non-invasive breast cancer. Although it does not cause symptoms in many cases, it can sometimes be detected as a lump or through changes seen on a mammogram. DCIS is important because it can increase the risk of developing invasive breast cancer if left untreated. The condition mainly affects women and is often found during routine breast cancer screening. Early detection and diagnosis are crucial for managing DCIS effectively.

Ductal Carcinoma in Situ (DCIS) is a non-invasive neoplasm characterized by the proliferation of malignant epithelial cells confined within the breast ductal system without invasion through the basement membrane. It arises from the ductal epithelium and is considered a precursor lesion to invasive ductal carcinoma. The pathogenesis involves genetic alterations such as mutations in TP53 and HER2/neu amplification, leading to uncontrolled cell growth. Clinically, DCIS is significant because it represents an early stage of breast cancer with potential progression to invasive disease if untreated. It is typically detected by microcalcifications on mammography and confirmed by histopathology. The presence of comedo necrosis and nuclear grade are important prognostic factors.