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SEER Inquiry System - Report
Produced: 12/10/2025 4:33 PM
Question 20051102
Inquiry Details
References:
2004 SEER Manual, C-476. July 2005
Question:
CS Extension--Breast: What is the CS Extent for this 2004 breast cancer? See Discussion.
Discussion:
A patient had lobular carcinoma of the left breast in 2000. At that time, she had bilateral simple mastectomies and the right breast was benign. In 2004, she notices a nodule in the right chest wall, which is excised and found to be invasive ductal ca and lobular ca in situ. So is this Sequence 2, C50.9, 8522/3. And what is the CS Extent - 40 chest wall? (The physician stages this as T2N0M0)
Answer:
This answer was provided in the context of CSv1 coding guidelines. The response may not be used after your registry database has been converted to CSv2.Residual breast tissue is present following a mastectomy. If the nodule is in the breast tissue (tissue above the ribs), assign CS extension code 10 [Confined to breast tissue...Localized, NOS]. If the nodule is in the chest wall (tissue below the ribs), assign code 40 [Invasion of chest wall].
Cancer Site Category:
Breast
Data Item Category:
N/A
Other Category:
N/A
Year:
2005
