Question: 20200033

Status


Final

Category


#1:   Solid Tumor Rules (2018)
#2:   Multiple primaries
#3:   Breast


References


Source 1:   2018 Solid Tumor Rules
pgs:  
Notes:   Breast; July 2019 Update
Source 2:  
pgs:  
Notes:  


Question


Solid Tumor Rules (2018)/Multiple primaries--Breast: How many primary tumors should be abstracted for a 2018 breast excision with a final diagnosis of invasive mucinous adenocarcinoma (0.7 cm) with ductal carcinoma in situ (DCIS) present as discontinuous foci, spanning 12 cm? See Discussion.
 



Discussion


If the term discontinuous foci means separate tumors, then rule M14 would apply making these multiple reportable tumors.



Answer


Abstract two primaries, invasive mucinous and DCIS, using 2018 Solid Tumor Rules for Breast, M14, as the discontinuous foci are separate tumors in this example and the histologies are on different rows of Table 3 of the rules.



History




Last Updated


07/20/2020

Date Finalized


09/11/2020