Neoplasms, Multiple Primary

**Definition:** Two or more abnormal growths of tissue occurring simultaneously and presumed to be of separate origin. The neoplasms may be histologically the same or different, and may be found in the same or different sites.

**Tree numbers:** - C04.651

**Synonyms:** - Multiple Primary Neoplasms, Synchronous - Neoplasms, Synchronous - Multiple Primary Neoplasms - Synchronous Multiple Primary Neoplasms - Synchronous Neoplasms - Neoplasms, Synchronous Multiple Primary