Causes

Nasal and paranasal tumors form when a genetic mutation turns normal, healthy cells into abnormal cells. Healthy cells grow and multiply at a set rate, eventually dying at a set time. Abnormal cells grow and multiply out of control, and they don't die. The accumulating abnormal cells form a mass (tumor).

If the abnormal cells become cancerous, they might invade nearby tissues and separate from an initial tumor to spread (metastasize) to other parts of the body.