SEER Inquiry System - Question 20051021 Details

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SEER Inquiry System - Report

Produced: 10/31/2025 12:36 PM

Question 20051021

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Inquiry Details

References:

2004 SEER Manual, C-469-C-470

Question:

Primary Site--Breast: If a patient has multifocal tumors all in the upper outer quadrant of the breast, is the primary site coded to C-504 because all of the tumors are in UOQ or would the site be coded to C509 to reflect the fact that multiple tumors exist?

Discussion:

Answer:

Code the primary site to C504 [Upper outer quadrant]. All disease is located in one quadrant, code that quadrant. When disease involves two or more quadrants and the point of origin cannot be determined, code C509 [Breast, NOS]. See 2004 SEER manual, page C-470 for instructions about invasive and in situ in different quadrants.

Cancer Site Category:

Breast

Data Item Category:

Primary site

Other Category:

N/A

Year:

2005