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The final diagnosis for a soft tissue excision is, "atypical lipomatous tumor/well-differentiated liposarcoma". The Comment section states, "Atypical lipomatous tumor/well differentiated liposarcoma has a significant risk for local recurrence, but no metastatic potential."

Per the 2010 SEER Manual, page 3, example 4: The pathologist makes the final decision about the behavior for a particular case. In this case, the pathologist uses both a reportable and a non-reportable term in the final diagnosis and in the comment section of the pathology report. Does the pathologist's comment impact the behavior and reportability of this tumor?

CT scan showed retroperitoneal and inguinal adenopathy. Right inguinal lymph node biopsy revealed "malignant lymphoma, peripheral T-cell type, with some features of angioimmunoblastic t-cell lymphoma and follicular t-cell lymphoma." Flow cytometry studies showed no evidence of B-cell lymphoma and atypical CD3+/CD10+/CD7-/CD4+/CD56+ T cells are detected (19%). The bone marrow biopsy was negative for involvement. Patient was staged as Stage II Peripheral T-Cell lymphoma by the oncologist and started chemotherapy.

The bone marrow biopsy proved bone marrow with blasts comprising 15-19%. Neither the pathologist nor the physician specifically diagnosed this as AML, calling this only high risk disease or early evolving AML prior to starting the patient on Vidaza.

No further information can be obtained from the pathologist or the physician for this case. Should this early evolving AML be accessioned as an additional primary per Rule M10, or is this the same MDS that is now high risk as the blast count is up to 19%, but has not yet reached the threshold of 20% blasts usually required for AML per the Hematopoietic and Lymphoid Neoplasm Database?

2/16/11 mesentery biopsy showed "follicular lymphoma, WHO grade 1-2, findings may represent an "in situ" follicular lymphoma."

3/7/11 clinician note stated, "nodularity of the mesentery which upon biopsy may be in situ follicular lymphoma. No treatment is necessary. This is not a proven malignancy. It may evolve into one. Plan 6 month follow-up and CT scans.

Do the notes from the oncologist and pathologist stating that this "may be" or "may represent" an in situ lymphoma make this case non-reportable?

The right breast ultrasound shows a 1.4 cm mass at 8 o'clock and a separate mass .6 cm at 7 o'clock (site code for both C50.5). Pathology report: Right 8 o'clock core needle biopsy fragments of intracystic noninvasive papillary carcinoma (8504/2), right 7 o'clock core needle biopsy fragments of intracystic noninvasive papillary carcinoma (8504/2). Then, another facility performs a right breast lumpectomy (operative note not available). Outside Facility: Right breast lumpectomy pathology shows invasive ductal carcinoma .6cm (8500/3) multifocal DCIS .5cm greatest dimension tumor site right breast NOS.

Should we use Rule M12-Abstract multiple primaries when separate/non-contiguous tumors are on different rows in Table 3 in the Equivalent Terms and Definitions. Timing is irrelevant. Note: Each row in the table is a distinctly different histology. So would this be two primaries C50.5 (8504/2) and C50.9 (8500/3)?

The Solid Tumor Rules instruct us not to use differentiation for coding histology unless it is specifically listed in the table. The terminology non-small cell carcinoma with neuroendocrine differentiation is not in lung histology Table 2.

However, SINQ 20150033, prior to Solid Tumor rules, indicates this diagnosis should be coded to 8574 (adenocarcinoma/carcinoma with neuroendocrine differentiation).

This presentation appears to represent distinctly different histologies. However, because the 2018 histology diagnosis is not in the table and the prior SINQ appears to disagree with current instruction, it is not clear how to apply the M rules to this case. The outcome of the histology coding will affect the number of primaries reported in this case.