Benign neoplasm: A neoplasm with no capacity or potential for either destructive growth or metastasis.

Malignant neoplasm: A neoplasm with capacity or potential for either destructive growth or metastasis.

Adenoma: A benign neoplasm of glandular tissue or glandular epithelium.

Carcinoma: A malignant epithelial neoplasm. Based on the presence or absence of stromal invasion, it can be categorized into either invasive carcinoma or carcinoma in situ. However, when the term carcinoma is used unmodified it generally refers to invasive carcinoma.

Carcinoma in situ: A malignant epithelial neoplasm that is still confined in the epithelium of origin.