Neoplasms at the cellular level that are incapable of spreading to distant sites are called benign tumors.

Here's a breakdown:

* Neoplasm: An abnormal mass of tissue.

* Benign: Non-cancerous. These tumors are typically slow-growing and encapsulated, meaning they have a distinct border. They usually do not invade surrounding tissues or spread to other parts of the body (metastasis).

* Malignant: Cancerous. These tumors grow rapidly, invade surrounding tissues, and can spread to other parts of the body.

While benign tumors are not cancerous, they can still cause problems depending on their size and location. They may press on nearby organs or tissues, leading to pain or dysfunction.