Cervical squamous intraepithelial lesion (SIL), previously called cervical intraepithelial neoplasia (CIN), is a form of dysplasia that can progress to cervical cancer.
The term carcinoma in situ may be used interchangeably with high-grade SIL.

Ductal carcinoma in situ of the breast is the most common precancer in women.

Bowen's disease is a squamous carcinoma in situ of the skin.

Colon polyps often contain areas of CIS that will almost always transform into colon cancer if left untreated.

High-grade prostatic intraepithelial neoplasia is equivalent to CIS of the prostate.

Bronchioloalveolar carcinoma (BAC) of the lung is the only form of CIS that can kill directly because, in rare cases (the "pneumonic form"), it expands greatly and fills the lungs, preventing breathing and causing other dire effects on the host.
Thus, the pneumonic form of BAC is a true malignant entity, but is not "invasive" in the classical sense.
For this reason, it is considered a form of CIS by pathologists, but not by oncologists or surgeons, and inclusion of this form of cancer among the types of CIS is controversial.
Cervical squamous intraepithelial lesion (SIL), previously called cervical intraepithelial neoplasia (CIN), is a form of dysplasia that can progress to cervical cancer. The term carcinoma in situ may be used interchangeably with high-grade SIL.
Ductal carcinoma in situ of the breast is the most common precancer in women.
Bowen's disease is a squamous carcinoma in situ of the skin.
Colon polyps often contain areas of CIS that will almost always transform into colon cancer if left untreated.
High-grade prostatic intraepithelial neoplasia is equivalent to CIS of the prostate.
Bronchioloalveolar carcinoma (BAC) of the lung is the only form of CIS that can kill directly because, in rare cases (the "pneumonic form"), it expands greatly and fills the lungs, preventing breathing and causing other dire effects on the host. Thus, the pneumonic form of BAC is a true malignant entity, but is not "invasive" in the classical sense. For this reason, it is considered a form of CIS by pathologists, but not by oncologists or surgeons, and inclusion of this form of cancer among the types of CIS is controversial.
Carcinoma in situ