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For cases diagnosed 2007 or later:

For date of diagnosis, use the date of the PET scan for both primaries. For the left tumor, assign diagnostic confirmation code 8 [Clinical diagnosis only] and assign histology code 8000/3 [malignant neoplasm].

The left lung mass is reported as a separate primary because there is one tumor in each lung. According to Rule M6, when there is one tumor in the left lung and one tumor in the right lung, each tumor is a separate primary. Tumor and mass are equivalent terms for purposes of the multiple primary rules.

For cases diagnosed 2007 or later:

For coding purposes, this is a papillary and follicular combination that would be coded to the combination code 8340/3 [Papillary carcinoma, follicular variant].

For thyroid cancer only, the term micropapillary does not refer to a specific histologic type. It means that the papillary portion of the tumor is minimal or occult, usually less than 1 cm. in diameter.

For cases diagnosed 2007 or later:

For a pleural or fallopian tube primary, if there is tumor(s) on the left and separate tumor(s) on the right and neither is stated to be metastatic from the other, abstract as multiple primaries according to rule M8 for other sites. If both sides are involved, but there is only one tumor, rule M2 for other sites applies and this is a single primary. Code each primary separately in CS.

For cases diagnosed 2007 or later:

Follow MP/H Other Sites Rule H11 and code 8144/3 [Adenocarcinoma, intestinal type]. Adenocarcinoma, intestinal type, is called that because it resembles the normal pattern of adenocarcinoma seen in the large intestines. It is not an indication of the location of the adenocarcinoma. We find that it is not uncommon in the sinuses, stomach, lungs, cervix, and many other organs.

For cases diagnosed 2007 or later:

First apply rule H9, code the invasive. To determine the code for the invasive histology, start with rule H10 and stop at rule H15. Code the histology 8503 [papillary]. Papillary (8503) and cribriform (8201) are listed in Table 1 as specific duct types, but in this case they are invasive.

Table 1 and Table 2 will be clarified in the next version of the MP/H rules.

For cases diagnosed 2007 or later:

Endometrioid adenocarcinoma with squamous metaplasia is coded 8570 [Adenocarcinoma with squamous metaplasia]. This falls under the Histology Coding Rules for Other Sites, rule H17. The code for Endometroid adenocarcinoma is 8380. The code for Adenocarcinoma with squamous metaplasia is 8570. The histology with the numerically higher ICD-O-3 code is Adenocarcinoma with squamous metaplasia -- 8570.

For cases diagnosed 2007 or later:

Endometrioid adenocarcinoma with squamous differentiation is coded to 8570 [Adenocarcinoma with squamous metaplasia].

The following row needs to be added to Table 2 in order to be able to correctly use the MP/H rules to reach this conclusion.

Column 1:   Endometrioid adenocarcinoma

Column 2:   Squamous metaplasia

                    Squamous differentiation

Column 3:   Adenocarcinoma with squamous metaplasia

Column 4:   8570

The change will be made in the next revision of the rules.

For cases diagnosed 2007 or later:

Do not abstract the 2007 events as a new primary. "Persistent disease" indicates there was never a disease free interval.

For cases diagnosed 2007 or later:

Code the histology 8140 [Adenocarcinoma, NOS] using Breast rule H14.

Code the histology from the final diagnosis on the pathology report of the most representative specimen (the lumpectomy in this case). Do not code histology from the microscopic description. Code the histology from the primary site whenever available, not the metastatic site.

Comments on pathology reports can be used to code histology. However, in this case the final diagnosis is more definitive than the comments. The comment provides several choices and none of these appear in the final diagnosis; an indication that the pathologist was not able to clearly identify a more specific type in this case.

For cases diagnosed 2007 or later:

Code malignant melanoma in situ with regression to 8720/2 [Melanoma in situ].

Code the histology according to the histologic type specified in the pathology report final diagnosis. Code the behavior as specified in the pathology report. Regression does not affect the coding of histology or behavior. See Melanoma Histology Coding rule H5. See 2007 SEER manual instructions for coding behavior, page 84.