MP/H Rules/Histology--Breast: How is histology coded for a diagnosis of "metaplastic carcinoma with the sarcomatous component of high grade sarcoma with focal areas of osteoid formation"? See Discussion.
Reportability--Appendix: Is a metastatic low-grade appendiceal mucinous neoplasm reportable if the pathologist states that it is a borderline tumor of the appendix? See Discussion.
MP/H Rules/Histology--Breast: How is histology coded for a breast primary with a final diagnosis of "infiltrating duct carcinoma with apocrine features"? See Discussion.
Primary site--Colon: How do you determine the correct subsite when there is conflicting information in different reports? Are there priority rules for coding subsite for sites other than Head and Neck? See Discussion.
Behavior--Breast: How is this field coded for a case in which the final diagnosis reports DCIS, but the CAP protocol or microscopic findings show microinvasion? See Discussion.
MP/H Rules/Multiple Primaries--Head & Neck: How many primaries should be reported when an invasive squamous cell carcinoma of the right mandibular body (C06.9) was diagnosed in 2004 (treated with surgery and radical neck dissection), and an invasive squamous cell carcinoma of the left buccal mucosa (C06.0) was diagnosed in 2007? See Discussion.
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