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Report Produced: 02/11/2026 10:16 AM

Report Question ID Question Discussion Answer Year
20100017 MP/H Rules/Multiple primaries--Prostate: Does adenosquamous carcinoma found in the prostate represent a second primary in a patient previously diagnosed with adenocarcinoma of the prostate? See Discussion.

Patient was diagnosed many years ago with adenocarcinoma of the prostate and treated with hormonal and radiation therapy. The patient recently underwent a TURP and is found to have adenosquamous carcinoma of the prostate. The pathology report comment states squamous carcinoma of the prostate is rare and is often associated with a history of hormonal or radiation therapy. There is no information indicating a history of a squamous carcinoma in the urinary system that could have involved the prostatic urethra.

Would the MP/H rules make this a second primary with the histology of 8560/3 [adenosquamous carcinoma]?

 For cases diagnosed 2007 or later, based on the limited information available for this unusual case, abstract a second prostate primary and code the histology as adenosquamous carcinoma. Rule M3 does not apply in this case. Apply rule M10. 2010
20100108 MP/H Rules/Histology--Brain and CNS: How is histology coded for a left occipital parietal area tumor stated to be a "low grade neuroectodermal neoplasm most consistent with neuronal tumor but lacking classic features of ganglioma" if the pathologist states the tumor is not malignant? Code 9505/0 [Ganglioglioma, benign] is the best option according to our pathology expert. He states, "There recently has been a spate of tumors called low grade glio-neuronal tumors that are not PNETs and have no propensity to become malignant." 2010
20100074 Laterality--Melanoma: For a melanoma case, does the term "mid" imply that the tumor is in the midline when the site is the skin of back (trunk)? Yes. When the location is described as mid-back or mid-chest with no indication of left or right, assign laterality code 5 [midline]. 2010
20100027 Reportability: Is AIN III reportable if it arises in the perianal skin? See Discussion. Physical exam states patient has a suspicious area of anal skin. Operative findings show a raised, suspicious lesion in the right perianal region. Our interpretation of the primary site would be skin and therefore not reportable. However, the final diagnosis on the pathology report indicates "AIN III/squamous cell carcinoma with focal areas suspicious for microinvasion. "SINQ #20041056 states that AIN III is reportable. AIN III of the anus or anal canal (C210-C211) is reportable. AIN III (8077) arising in perianal skin (C445) is not reportable. 2010
20100070 Histology--Heme & Lymphoid Neoplasms: How is this field coded for a follicular lymphoma, grade 2 of 3, predominantly nodular?

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

Code histology to 9691/3 [Follicular lymphoma, grade 2]. Nodular lymphoma is an obsolete term once used to describe follicular lymphoma. (See Appendix A, Table A3)

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.

2010
20100028

Primary site/Histology--Head & Neck: How are these fields coded when the final diagnosis for a skull based mass is "neuroendocrine carcinoma" and the IHC studies are incompatible with a brain/spinal cord primary (ependymoma)? See Discussion.

The pathology report final diagnosis is, "skull base mass, biopsy: neuroendocrine carcinoma, see note. NOTE: Ancillary IHC studies reveal ...the IHC signature is incompatible with ependymoma. The constellation of findings is diagnostic of well differentiated neuroendocrine carcinoma."

The site/histology combination of C410 and 8246/3 is 'impossible' by SEER edits. There is no override. What is the correct primary site and histology?

According to our subject matter expert physician, this unusual case is most likely a sino-nasal tumor (some variant of esthesioneuroblastoma [olfactory neuroblastoma]). Code to nasal cavity [C300] as indicated in ICD-O-3 by site-associated topography code attached to the morphology code for olfactory neuroblastoma [9522/3].

 2010
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].

2010
20100010

MP/H Rules/Multiple primaries--Ovary: How many primaries are to be abstracted when a patient is diagnosed with serous cystadenocarcinoma [8441] of the right ovary and clear cell adenocarcinoma [8310] of the left ovary? See Discussion.

Patient had bilateral ovarian tumors. The right ovary had serous cystadenocarcinoma and left ovary had clear cell adenocarcinoma. The pathology COMMENT section stated, "Based on the histologic differences of the tumors within each ovary, feel these represent two distinct separate primaries. Lymph node metastases are clearly serous ca." The physician staged the right ovary as T2a N1 M0 and left ovary as T1c N0 M0. Do we accession one primary per rule M7 [Bilateral epithelial tumors (8000-8799) of the ovary within 60 days are a single primary]?

What is intention of Rule M7? If the histology in each ovary is different but within the range (8000-8799), is that supposed to be accessioned as one primary? Or is the intention of Rule M7 that tumors in both ovaries must have the SAME histology within that histology range to be a single primary?

For cases diagnosed 2007 or later, apply rule M8 and abstract this case as multiple primaries.

Rule M7 does not apply when each ovary has a distinctly different histology, even when both histologies are with the specified code range. This clarification will be added to the next version of the rules.

 2010
20100107 MP/H Rules/Histology--Kidney, renal pelvis: How is histology coded for a tumor described as "renal cell carcinoma, clear cell with rhabdoid features"? See Discussion.

Is the statement "with __ features" indicative of a specific type of renal cell carcinoma (that is not represented by a specific histology code) or a second histologic type? Per ICD-O, "malignant rhabdoid tumor" is coded 8963/3. "Rhabdoid" is not listed in Table 1 in the MP/H rules as a specific type of renal cell carcinoma.

Rhabdoid features occur in about 5% of all renal cell cancers and indicate a more aggressive tumor. Per WHO, these tumors comprise approximately 2% of all pediatric tumors with a median diagnosis age of 1-2 years old. This diagnosis is highly suspect in patients over age 3. Most previously reported rhabdoid tumors over age 5 have subsequently proven to be renal medullary carcinomas.

For cases diagnosed 2007 or later, if the patient in this case is a child, apply Kidney Rule H7 and code histology to 8963/3 [malignant rhaboid tumor]. Otherwise, we strongly suggest you consult with the pathologist to determine if this is truly a rhabdoid rather than a medullary tumor.

 2010
20100069 Primary site--Heme & Lymphoid Neoplasms: How is this field coded when a 5/26/10 colonoscopy reveals ulcers in the cecum, ascending, transverse, descending, and sigmoid colon and, the final diagnosis on the pathology report is post-transplant lymphoproliferative disorder [9971/3]?

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

Code the primary site to C189 [Colon, NOS] per Rule PH1.

Code the primary site to C189 [Colon, NOS] and not C188 [Colon, overlapping lesion] because there are multiple ulcers in different segments of the colon. The .8 code is used only for a single lesion that overlaps subsites.

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.

2010