Confocal Histolog Scanner in Routine Breast-Conserving Surgery (CHiB)

This study is evaluating a new scanner that uses reflected light (confocal microscopy) to examine the edges of tissue removed during breast-conserving surgery (a lumpectomy) in real time, while the patient is still in the operating room. The goal is to reduce the need for additional surgeries by more accurately checking whether the cancer was fully removed the first time. **You may be eligible if...** - You are a woman aged 18 or older - You are scheduled for breast-conserving surgery (lumpectomy) for invasive or in-situ (non-invasive) breast cancer - You are able to understand and sign the informed consent form **You may NOT be eligible if...** - You are planned to have a full mastectomy (complete breast removal) - You have a condition or circumstance that makes participation unsafe or impractical - You have had prior surgery on the same breast area being evaluated Talk to your doctor to see if this trial is right for you.