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.

第二种原位叫做小叶原位（LCIS），指肿瘤细胞局限小叶内，并不侵犯导管，导致受累泡变大。

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.

乳初通常为原位，可以是导管内原位（DCIS）局限导管内，或小叶原位（LCIS）局限小叶。