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The patient has testicular cancer with bilateral lung metastases and possible liver metastasis. The left orchiectomy final diagnosis was The Summary describes a single tumor that is, Germ cell neoplasia in situ (GCNIS) is also present. Although there is mixed germ cell tumor present, the PNET component of the tumor is locally invasive extending into the epididymis, hilar soft tissues, spermatic cord, and tunica vaginalis. The mixed germ cell tumor is limited to the testis only.

We are instructed not to use to the term to code histology in the MP/H Rules General Instructions (Other Site Rules not updated for 2018), however the PNET comprises the majority of this tumor and represents the most extensive disease. Should the PNET histology be ignored in this case as its a ?

Patient had a total abdominal hysterectomy-bilateral salpingo-oophorectomy performed in January 2023 with final diagnosis of myxoid and epithelioid leiomyosarcoma.

Diagnosis comment states: The tumor is 15 cm per report. It grows in nests and poorly formed interanastomosing trabeculae and cords that are separated by abundant myxoid background. The cells have an epithelioid morphology with eosinophilic cytoplasm, large nuclei, and very prominent nucleoli. The mitotic activity is overall low ranging from 1 to 3/10 HPFs.

Immunohistochemical stains performed at the outside hospital showed diffuse positivity for SMA, desmin, caldesmon, and PR. They are negative for CD10, claudin-4, calretinin, HBM45, MART1 (rare weakly positive cells), PANCK, and SOX10. This immunohistochemical profile supports a smooth muscle derivation of this neoplasm. As this tumor is extensively myxoid, diagnostic criteria differ from the spindle cell leiomyosarcoma.

Per Solid Tumor Rules Other Sites, Table 16: Uterine Corpus Histologies, Epithelioid Leiomyosarcoma (8891/3) and Myxoid Leiomyosarcoma (8896/3) are both subtypes of Sarcoma, NOS (8800/3).  Per Rule H21, use a combination code when there are multiple specific histologies AND the combination is listed in Table 2 OR there are coding instructions for the combination in the applicable histology Tables 3-21 OR you receive a combination code from Ask A SEER Registrar.  Since there is no combination listed in Table 2 and there is no instruction for the combination in Table 16, how should the histology be coded for this tumor?

Previous SINQ 20091100 has a similar scenario and the instruction was to code as lentigo maligna (8742/2); however, it does not appear to be applicable to cases diagnosed after 2020.

The WHO Blue Book does not list melanoma, lentiginous type or lentiginous melanoma in situ as an alternate term for lentigo maligna and neither do the STR or the ICD-O-3.2.

Note 1 states that this histology is treatment-related neuroendocrine prostatic carcinoma demonstrating complete neuroendocrine differentiation or partial neuroendocrine differentiation with adenocarcinoma after androgen-deprivation therapy (ADT). Conversely, Note 2 says to code 8574/3 only when there is no history of previous prostate adenocarcinoma or history of androgen-deprivation therapy.

The WHO Blue Book does confirm this is a treatment-related histology, so it seems we would only use this for an adenocarcinoma with neuroendocrine differentiation (or even possibly a mixed histology tumor with adenocarcinoma and small cell carcinoma components) if the patient had previous treatment.

If this histology is treatment-related, why would we use this code for a patient without a history of prostate adenocarcinoma or androgen-deprivation therapy? Should Note 2 be corrected?

Does this histology apply to a post-treatment diagnosis of mixed adenocarcinoma and small cell carcinoma? If yes, should this clarification be added?

There is no histology listed in the ICD-O-3 for a mammary analogue secretory carcinoma. The pathologist stated that, "MASC is a recently described salivary gland tumor type which, as the name implies, resembles secretory carcinoma of the breast." Should the histology be coded 8550/3 [acinar carcinoma] or 8502/3 [secretory carcinoma of breast]?

After a little research, it appears as though Endometrial Dedifferentiated carcinoma is a relatively new term and is set to be included in ICD-O-3.2:

http://www.iacr.com.fr/index.php?option=com_content&view=category&layout=blog&id=100&Itemid=577

If you look at the link on that page for All Additions, Changes, and Revisions to the ICD-O-3, 1st Revision for ICDO-3.2, there is 8020/3 Dedifferentiated carcinoma. Currently, 8020/3 is Carcinoma, undifferentiated, NOS. For 2018 diagnosis, would you use 8020/3 for a predominantly dedifferentiated carcinoma with focal well-differentiated endometrioid adenocarcinoma as stated in the pathology: Uterus, bilateral ovaries and fallopian tubes; supracervical hysterectomy/BSO: Predominantly dedifferentiated carcinoma with focal well-differentiated endometrioid adenocarcinoma in the endometrium, FIGO grade 1 Portion of omentum, omental/anterior abdominal wall/ round ligament/uterine/small bowel mesenteric tumor nodules all involved by dedifferentiated carcinoma. Synoptic reads as follows: Histological Type: Endometrioid carcinoma, NOS Dedifferentiated carcinoma predominantly Histological Grade: Endometrioid carcinoma, FIGO grade 1.

Total thyroidectomy Final Diagnosis: Papillary carcinoma, classical type, with papillary and follicular architecture.

The 2007 MP/H rules state that the term architecture is reserved for coding subtype of in situ primaries only. However, SINQ 20130165 appears to indicate this should be coded for invasive thyroid subtypes as well. Can you confirm the addition of the term architecture for determining an invasive histologic subtype for thyroid?

This specific histology (cribriform-morula variant of papillary thyroid carcinoma) is not found in the ICD-O and is not mentioned in the 2007 MP/H Manual. However, per a web search it appears that this is a distinct type of papillary thyroid carcinoma (http://erc.endocrinology-journals.org/content/24/4/R109.full).

Example: Right lobectomy shows thyroid epithelial neoplasm, pending consultation.

Consultation: Thyroid gland, right lobe: papillary thyroid carcinoma, favor cribriform-morula variant.

Consultation Comment: IHC stains argue against medullary carcinoma. The histologic features of growth patterns and cytologic atypia (with rare grooves and pseudoinclusions) and the immunohistochemical profile support a diagnosis of papillary thyroid carcinoma, favoring the cribriform-morula variant. It is important to note that a significant number of patients with this variant of papillary thyroid carcinoma have been associated with familial adenomatous polyposis syndrome.