SEER Inquiry System - Question 20061068 Details

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Produced: 10/19/2025 3:16 PM

Question 20061068

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Inquiry Details

References:

ICD-O-3

Question:

Primary Site--Unknown & ill-defined site: Should the primary site be coded to C809 [Unknown primary site] or C761 [Thorax, NOS] if the patient died following a limited work-up that included on a cytology on pericardial fluid that was positive for poor differentiated adenocarcinoma?

Discussion:

Answer:

Based on the information provided, code the primary site to C809 [Unknown primary site]. There is not enough information provided to suggest that the primary site is the thorax or any other location.

Cancer Site Category:

Unknown & ill-defined sit

Data Item Category:

Primary site

Other Category:

N/A

Year:

2006