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Report Produced: 11/06/2026 20:31 PM

Report Question ID Question Discussion Answer Cancer Site Category Data Item Category Year
20021108 Histology (Pre-2007)/Grade, Differentiation: What code is used to represent the histology of "well differentiated low grade lipoma-like liposarcoma (atypical lipoma)"? See discussion. The pathologic microscopic description states, "Well differentiated lipoma-like liposarcoma, sometimes termed atypical lipoma. This tumor will behave in a low grade malignant fashion. Slow growing recurrences can be expected. Metastatic disease is very rare unless the tumor dedifferentiates."

For tumors diagnosed prior to 2007:

Code the Histology field to 8851/3 [Liposarcoma, well differentiated] and the Grade to 1 [Well differentiated]. This histology is reportable to SEER.

For tumors diagnosed 2007 or later, refer to the MP/H rules. If there are still questions about how this type of tumor should be coded, submit a new question to SINQ and include the difficulties you are encountering in applying the MP/H rules.

 N/A Histology 2002
20041047 Multiple primaries (Pre-2007)/EOD-Extension--Fallopian Tube: How many primaries are coded when endometrioid adenocarcinoma involves bilateral fallopian tubes? See Discussion. The pathologist states "because of the intimate association with the luminal line of the fallopian tube it is felt that this represents synchronous primaries rather than mets." The SEER Code Manual only lists ovary, retinoblastomas, and Wilms Tumors under the bilateral code stated to be a single primary.

For tumors diagnosed prior to 2007:

Complete two abstracts, one for left fallopian tube and one for right fallopian tube. This case has been determined to be two primaries by the pathologist. Bilateral involvement of paired sites (other than ovary, retinoblastoma and Wilms tumor) with the same histology within two months requires a determination of whether there are one or two primaries. The pathologist in the case above has made this determination.

For tumors diagnosed 2007 or later, refer to the MP/H rules. If there are still questions about how this type of tumor should be coded, submit a new question to SINQ and include the difficulties you are encountering in applying the MP/H rules.

 N/A N/A 2004
20130220 Reportability--Thyroid: Is a hyalinizing trabecular neoplasm of the thyroid reportable? See Discussion. The pathology comment states: Hyalinizing trabecular neoplasm is considered by some to represent a variant of papillary thyroid carcinoma because of the similar nuclear cytology, immunoprofile and RET-oncogene rearrangements.

Hyalinizing trabecular neoplasm is not reportable.

Hyalinizing trabecular neoplasm, or hyalinizing trabecular tumor, is a synonym for hyalinizing trabecular adenoma [8336/0] in the ICD-O-3. The 2004 WHO classification states that "fine needle aspiration biopsy is often interpreted as papillary carcinoma because of the nuclear features in the tumor."

Thyroid N/A 2013
20100029 MP/H Rules/Histology--Corpus uteri: How should histology be coded and how many primaries should be accessioned for an endometrial primary in which curettings showed malignant mixed mullerian tumor (carcinosarcoma) but hysterectomy specimen showed endometrioid adencarcinoma? See Discussion. The pathology report COMMENT for the hysterectomy specimen stated that the previous curettage was reviewed. The findings are compatible with malignant mixed mullerian tumor. No residual features of malignant mixed mullerian tumor are found in the current resection, which shows FIGO grade I adenocarcinoma in the wall of the uterus. The malignant mixed Mullerian tumor appears to have been removed with the curettage. There is no information available regarding the number of tumors in these specimens.

For cases diagnosed 2007 or later, abstract a single primary. Rule M1 applies because there is no information on the number of tumors and there is no way to know whether the curettage sample was from a separate tumor or from the tumor in the hysterectomy specimen.

Apply rule H17 and code histology to 8980/3 for malignant mixed Mullerian tumor [Carcinosarcoma, NOS].

Corpus uteri Histology 2010
20000242 EOD-Size of Primary Tumor--Prostate: Should the size of tumor be recorded as 001 (focus) or the actual size when both are stated? See Discussion. The pathology report from a TURP identifies a 3-mm focus of adenocarcinoma. For cases diagnosed 1998-2003, code the EOD-Size of Primary Tumor field to 003 [3 mm]. The rule that says to code a focus or foci of tumor as 001 was developed for use when no tumor size is given. Prostate N/A 2000
20110140 MP/H Rules/Behavior--Breast: How are behavior and histology coded when the pathology report final diagnosis is "ductal carcinoma in situ and lobular carcinoma in situ" if the microscopic examination section of the same pathology report states there are "foci suspicious for microinvasive carcinoma"? See Discussion. The pathology report microscopic examination states, "focally, between ducts involved by DCIS, there are minute tubular structures associated with stromal fibrosis and chronic inflammation. These foci are suspicious for microinvasive carcinoma."

For cases diagnosed 2007 or later, code one primary with histology and behavior coded to 8522/2 [intraductal carcinoma and lobular carcinoma in situ].

The steps used to arrive at this decision are as follows

Open the Multiple Primary and Histology Coding Rules manual. Choose one of the three formats (i.e., flowchart, matrix or text) under the Breast Histology rules. The module you use depends on the behavior and number of tumors identified in the primary site. The information provided does not specify whether this was a single tumor with DCIS and LCIS or multiple tumors with DCIS and LCIS. In this case, the number of tumors does not change the histology code for this patient. For this example, assume this disease process was a single tumor.

Start at the SINGLE TUMOR: In Situ Carcinoma Only module. The rules are intended to be reviewed in consecutive order from Rule H1 to Rule H8. Stop at the first rule that applies to the case you are processing. Code the histology as 8522/2 (intraductal carcinoma and lobular carcinoma in situ) when there is a combination of in situ lobular (LCIS) [8520] and intraductal carcinoma (DCIS).

Do not code the behavior as invasive in this case. The pathologist indicated that these findings were "suspicious" but not definite in the microscopic examination. If the pathologist decided that this was truly an invasive tubular element, it would have been included in the final diagnosis.

Breast N/A 2011
20031085 Primary Site/Histology (Pre-2007): What are the correct site and histology codes for "tubal serous adenocarcinoma" identified in a fallopian tube? See Description. The pathology report of a laparoscopic left salpingo-oophorectomy states: 1.5 cm intraluminal mass left fallopian tube: micro: tubal serous adenocarcinoma, poorly differentiated, infiltrates the muscular wall of the fallopian tube; serosa does not appear to be penetrated. The left ovary is negative for malignancy.

For tumors diagnosed prior to 2007:

Code histology as 8441 [serous adenocarcinoma].

The primary site for this case is fallopian tube, not the suggested site code of ovary.

For tumors diagnosed 2007 or later, refer to the MP/H rules. If there are still questions about how this type of tumor should be coded, submit a new question to SINQ and include the difficulties you are encountering in applying the MP/H rules.

 N/A Histology, Primary site 2003
20120054 Histology/Behavior--Brain and CNS: What is the histology and behavior code for a "giant cell astrocytoma"? See Discussion. The pathology report stated, "The giant cell astrocytoma should be considered at least grade 3." There is not a code in the ICD-O-3 for giant cell astrocytoma, NOS; there are only codes for astrocytoma, NOS [9400/3] and subependymal giant cell astrocytoma [9384/1]. Code the morphology as giant cell glioblastoma [9441/3]. Glioblastoma and astrocytoma are both types of astrocytic tumors per the Brain and CNS Terms and Definitions, Chart 1, in the 2007 MP/H Rules Manual. Brain and CNS Behavior, Histology 2012
20130101 Reportability--Heme & Lymphoid Neoplasms: Is plasma cell dyscrasia, favor MGUS vs. smoldering myeloma reportable? See Discussion. The pathology report states, "plasma cell dyscrasia, favor MGUS vs. smoldering myeloma." The patient then died of a heart attack and no further information is available. If this is reportable, what histology code applies?

For cases diagnosed 2010 and forward, access the Hematopoietic Database at http://seer.cancer.gov/seertools/hemelymph.

This case is not reportable. Neither plasma cell dyscrasia nor MGUS are reportable. Smoldering myeloma was given as a possible diagnosis, but never confirmed.

SEER*Educate provides training on how to use the Heme Manual and DB. If you are unsure how to arrive at the answer in this SINQ question, refer to SEER*Educate to practice coding hematopoietic and lymphoid neoplasms. Review the step-by-step instructions provided for each case scenario to learn how to use the application and manual to arrive at the answer provided. https://educate.fhcrc.org/LandingPage.aspx.

Heme & Lymphoid Neoplasms N/A 2013
20110107 Primary site/Histology--Heme & Lymphoid Neoplasms: How are these fields coded for a precursor T lymphoblastic leukemia involving the bone marrow and peripheral blood (per pathology) with a clinically noted large mediastinal mass and cervical lymphadenopathy? See Discussion. The patient had a large mediastinal mass and cervical lymphadenopathy, however, no biopsy was performed of either area nor was there a specific statement indicating involvement. The bone marrow biopsy showed 100% cellular marrow with involvement by precursor T lymphoblastic leukemia. The peripheral blood also showed precursor T lymphoblastic leukemia. The discharge summary and office notes state the diagnosis as T-cell acute lymphoblastic leukemia.

For cases diagnosed 2010 and forward, access the Hematopoietic Database at http://seer.cancer.gov/seertools/hemelymph.

Code the histology to 9837/3 [adult T cell leukemia/lymphoma] and the primary site to C778 [lymph nodes, multiple regions]. Per Rule PH8, code the primary site to the site of origin when lymph node(s) or lymph node region(s), tissue(s) or organs are involved. A statement of "mediastinal mass" and lymphadenopathy for lymphoma primaries is equivalent to lymph node involvement. To identify the more specific primary site, you need to move to Rule PH21 that indicates you are to code the primary site as multiple lymph node regions, NOS [C778] when multiple lymph node regions, as defined by ICD-O-3, are involved and it is not possible to identify the lymph node region where the lymphoma originated.

SEER*Educate provides training on how to use the Heme Manual and DB. If you are unsure how to arrive at the answer in this SINQ question, refer to SEER*Educate to practice coding hematopoietic and lymphoid neoplasms. Review the step-by-step instructions provided for each case scenario to learn how to use the application and manual to arrive at the answer provided. https://educate.fhcrc.org/LandingPage.aspx.

Heme & Lymphoid Neoplasms Histology, Primary site 2011