The second type is called lobular carcinoma in-situ, or LCIS, and that's where clusters of tumor cells grow within the lobules, without invading the ducts, causing the affected alveoli to enlarge.

第二种叫做小叶（LCIS），指肿瘤细胞局限小叶内，并不侵犯，致受累腺泡变大。

Breast cancer usually begins as an in-situ carcinoma, which can either be ductal carcinoma in-situ, or DCIS, which is localized to the ducts, or lobular carcinoma in-situ, or LCIS, which is localized within the lobules.

乳腺起初通常为，可以是内（DCIS）局限内，或小叶（LCIS）局限小叶。