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Abstract this case as a single primary and code histology as carcinosarcoma (8980/3). The carcinosarcoma is intermixed with the EIN making this a single primary coded to the invasive histology. EIN is a precursor of endometrial carcinoma in the WHO Classification of Female Genital Tumors, 5th edition. Carcinosarcoma of the uterus is described in the literature as an aggressive variant of endometrial carcinoma characterized by unusual histologic features including discrete malignant epithelial and mesenchymal components (carcinoma and sarcoma).

Assign code 8249/3, neuroendocrine tumor, grade 2 based on the pathologist statement of mammary neuroendocrine tumor grade 2.  According to WHO Classification of Tumors of the Breast, 5th edition, neuroendocrine tumor (NET) is an invasive tumor characterized by low/intermediate grade.

If the histology term is not listed in the Solid Tumor rules, the instructions state to also check ICD-O and updates. Per ICD-O, NET, grade 2 is coded 8249/3. Breast Table 3 will be updated for 2023.

The clinical assessment code takes priority over the pathological assessment code in this case because the clinical assessment was worse than the pathologic assessment. Although there was a pathological assessment, the clinical assessment is greater. According to the general coding guidelines for neoadjuvant therapy, code the worst information, which in this case is the clinical assessment.

The 2018 EOD General Instructions for EOD Regional Nodes, instruction #4, addresses neoadjuvant therapy as follows. Neoadjuvant (preoperative) therapy: If the patient receives neoadjuvant (preoperative) systemic therapy (chemotherapy, immunotherapy) or radiation therapy, code the clinical information if that is the most extensive lymph node involvement documented.

A new note is being included for the 2022 updates. Exception: If patient has neoadjuvant therapy, and the clinical assessment is greater than the pathological assessment, the clinical assessment code takes priority.

Code the behavior to /3, not just to pass edits, but because this is an invasive case based on the positive lymph nodes.

For most cases, behavior is based on the primary tumor, but in situations like this where an invasive component cannot be found and there are positive lymph nodes, the /3 behavior is assigned based on the positive lymph nodes.

Abstract separate primaries using Rule M15 of the Hematopoietic and Lymphoid Neoplasms (Heme) Manual. The Heme Database states: Excluded from this category are progression of myeloproliferative neoplasms (MPNs) and evolution of primary MDS or primary MDS/MPN to acute myeloid leukemia (AML); in each of these latter cases evolution to AML is part of the natural history of the primary disease and it may be impossible to distinguish natural progression from therapy-related changes. There is no indication of transformation.

The following cancer cases are reportable unless there is information to the contrary.

–Liver cases with an LI-RADS category LR-4 (reportable since 2021) or LR-5 (reportable since 2016)

–Prostate cases with a PI-RADS category 4 or 5 (reportable since 2017)

The following are not reportable without additional information.

–Breast cases designated BI-RADS 4, 4A, 4B, 4C or BI-RADS 5

–Lung cases designated Lung-RADS 4A," 4B, or 4X

–Liver cases based only on an LI-RADS category of LR-3

–Colon cases with only C-RADS information (C-RADS category C4 is not reportable by itself)

–Head and Neck cases with only NI-RADS information (NI-RADS category 3 is not reportable by itself)

–Ovarian or fallopian tube cases with only O-RADS information (none of the O-RADS categories are reportable without additional information)

–Thyroid cases with only TI-RADS information (none of the TI-RADS categories are reportable without additional information)

Report retroperitoneal paraganglioma based on ICD-O-3.2 histology/behavior that lists paraganglioma, NOS as 8680/3 for cases diagnosed 2021 and forward. While GAPP is a predictor of metastatic potential, it does not factor into behavior, thus reportability.

Chrondrosarcoma, grade 1 (9222/1) is not reportable according to the Reportability section in the 2021 SEER Manual. The histology (9222/1) is listed in ICD-O-3.2 as a synonym for atypical cartilaginous tumor (preferred term).

In general, the tables do not include non-reportable terms and codes. Registrars should refer to their standard setter (to whom they submit data) for reportable neoplasms. Currently, /0 and /1 neoplasms are reportable for central nervous system sites only. ICD-O-3.2 includes all neoplasms but that does not mean they are reportable. If a facility collects non-malignant neoplasms, use the corresponding ICD-O code in 3.2.

Intramucosal carcinoma of the colon is assigned behavior code of /3. Intramucosal is not the same as in situ in terms of behavior. Behavior and staging are separate concepts, although there is some overlap. Use the instructions for coding behavior to code this field. Do not use stage to determine behavior in this case.

For purposes of Summary Stage, intramucosal carcinoma is a localized lesion; however, for purposes of AJCC staging, assign Tis for the stage.

Clarify the statement of "excellent" with the managing physician if possible. If no further information can be obtained, assign code 8 in Neoadjuvant Therapy–Clinical Response and document the details in text fields.