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SEER Inquiry System - Report
Produced: 05/25/2026 5:44 AM
Question 20180035
Inquiry Details
References:
Solid Tumor Rules. Lung
Question:
Solid Tumor Rules (2018)/Multiple Primaries--Lung: How many primaries should be abstracted in this 2018 lung case? See Discussion.
Discussion:
CT chest findings: 1. There is a dominant 1 cm. nodule in the left mid lung. 2. In addition, there is a new rather dominant bilobed nodule in the left lung base. 3. Distant metastases are not identified. Four months later, a doctor's note says routine follow-up visit status post Cyber Knife stereotactic body radiation therapy for synchronous early stage non-small cell carcinomas of the left upper and left lower lobes, both Stage IA. He is medically inoperable. This situation is described as a second primary tumor in AJCC8 page 438. However, by the 2018 Lung Solid Tumor rules, this would be a single primary, per rule M7. Is that correct?
Answer:
Abstract one primary per Rule M7. Follow the Lung Solid Tumor Rules to determine the number of primaries. The AJCC TNM manual is used for staging. Do not apply AJCC instructions to determine the number of primaries.
