Final answer:
When a patient has cancer that has consumed their entire body and there is no record of a primary neoplasm listed, the primary neoplasm would typically be listed as "unknown."
Step-by-step explanation:
When a patient has cancer that has consumed their entire body and there is no record of a primary neoplasm listed, the primary neoplasm would typically be listed as "unknown." This is because the primary neoplasm refers to the original site where the cancer started, and in this case, it is not known.