Lobular Carcinoma in Situ (Breast)

Lobular Carcinoma in Situ (LCIS) is a condition affecting the breast tissue, specifically the milk-producing lobules. It is not a true cancer but rather a marker indicating an increased risk of developing breast cancer in the future. LCIS usually does not cause symptoms and is often found incidentally during biopsies for other breast abnormalities. The condition involves abnormal cells growing inside the lobules without invading surrounding tissues. While LCIS itself does not typically affect breast function, it signals a higher chance of developing invasive breast cancer later on. Regular monitoring and follow-up are important for managing health after an LCIS diagnosis.

Lobular Carcinoma in Situ (LCIS) is a non-invasive neoplastic proliferation of monomorphic, small, uniform cells confined to the terminal duct-lobular units of the breast. It arises due to loss of E-cadherin expression, leading to discohesive cells that lack adhesion, distinguishing it from ductal carcinoma in situ. LCIS is considered a marker of increased risk for developing invasive breast carcinoma, particularly invasive lobular carcinoma, rather than a direct precursor lesion. It is often multifocal and bilateral, reflecting a field effect in breast tissue. The clinical significance lies in its role as a risk indicator rather than a lesion requiring immediate surgical excision. Diagnosis is usually incidental during biopsy for other breast abnormalities or screening mammography findings.