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SEER Inquiry System - Report
Produced: 12/26/2025 7:42 PM
Question 20071071
Inquiry Details
References:
2007 SEER Manual, C-527 - C-528. Appendix C
Question:
MP/H Rules/Multiple Primaries--Lung: If the biopsy for a lung primary is actually taken from a pleural mass, can the default rule "when there are several lung masses and only one lesion is biopsied, consider this a single primary" apply? See Discussion.
Discussion:
Scenario: A parenchymal lesion in each lung. One lung also has a pleural lesion. MD biopsies the pleural mass only and it is positive for cancer.
Answer:
For cases diagnosed 2007 or later:
Do not assume the biopsy of the pleural mass is a biopsy of the lung. Apply the 2007 MP/H Lung rules to the lung tumors only. For this case, the pleural lesion would be a metastasis (outside the lung). The 2007 MP/H rules do not apply to metastatic lesions.
The 2007 MP/H Lung rules do not apply to pleura as a primary site. If the pleural lesion is primary, it should be abstracted as a separate primary.
