Lobular carcinoma is a type of breast cancer that begins in the lobules, which are the glands responsible for producing milk. It is characterized by small, non-palpable tumors that can be more challenging to detect through traditional imaging methods like mammograms. This cancer often grows in a single-file pattern, making it distinct from other types of breast cancer. There are two main types of lobular carcinoma: invasive and non-invasive. Invasive lobular carcinoma can spread to surrounding tissues, while lobular carcinoma in situ (LCIS) is considered a marker for increased breast cancer risk but does not invade nearby tissues. Early detection and treatment are crucial for better outcomes.