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Report Produced: 09/21/2026 13:14 PM

Report Question ID Question Discussion Answer Cancer Site Category Data Item Category Year
20081077 MP/H Rules--Ovary: How do you code histology for a diagnosis of "clear cell CA, predominately cystic." For cases diagnosed 2007 or later, assign histology code 8310 [Clear cell carcinoma]. Cystic describes the appearance of the tumor. Clear cell is the histologic type. Code clear cell carcinoma 8310/3. Rule H11 applies. Ovary N/A 2008
20081086 Reportability: Is a case reportable if a benign diagnosis is obtained on a resection that follows a positive needle aspiration? See Discussion. Fine needle aspiration of the thyroid diagnosis was "positive for malignant cells, favor medullary carcinoma." Subsequent thyroidectomy was reported as benign. This case is reportable. The cytology is positive. Report as medulary carcinoma of the thyroid. N/A N/A 2008
20081110

MP/H Rules--Breast: Is a ductal carcinoma diagnosed in August, 2008 following a lobular-ductal primary diagnosed in February 2007 a new primary? See Discussion.

Patient has two right breast tumors excised in February, 2007. One is lobular and the other ductal - abstracted as single primary per rule M10. Patient presents with new right breast tumor in August, 2008. This is a ductal carcinoma stated to be a recurrence. Would we again stop at M10 (single primary) or continue on to M12 and make this a new primary (difference at third number)?

For cases diagnosed 2007 or later:

Stop at rule M10 -- this is the first rule that applies. The 2008 diagnosis is not a new primary.

 Breast N/A 2008
20081100

MP/H Rules/Histology--Rectum: When not specifically mentioned as part of the histology, is the adenoma a second histologic type, or just a further physical description of the tumor? See Discussion.

Rectal tumor resection (APR) path report final dx: "mucinous carcinoma, see comment". The comment is the CAP-format tumor summary, which states "histologic type: adenocarcinoma with extensive mucin production (mucinous or colloid carcinoma). Additional pathologic findings: adenomas - tumor arises in a tubulovillous adenoma".

If you follow the rules and only use the final dx, you would code a different histology than if you use the 'additional path findings.'

For cases diagnosed 2007 or later

Other Sites histology rule H12 applies in this case. Assign histology code 8263 [adenocarcinoma in tubulovillous adenoma].

Use information from the CAP protocol and from comments associated with the final diagnosis to code histology.

The fact that the malignancy arose in a polyp can be taken from anywhere in the medical record; not limited to the final diagnosis.

Based on the information provided for this case, the histology is adenocarcinoma with extensive mucin production (mucinous or colloid carcinoma) arising in a tubulovillous adenoma.

 N/A Histology 2008
20081063 MP/H Rules--Breast: How many primaries should be abstracted when a patient has a mass at 6:00 that showed poorly differentiated ductal carcinoma and a hypoechoic nodule at 9:00 that was excised with no real tumor present there though path showed angiolymphatic invasion by carcinoma throughout the entire specimen? See Discussion.

Palpable mass in right breast at 6:00. Path stated 'poorly differentiated ductal carcinoma with extensive necrosis and extensive angiolymphatic invasion. Focal high grade comedocarcinoma (1%)'. Another hypoechoic nodule was seen at the 9:00 position. This mass was excised from surrounding tissue. This mass was more like an inflammatory mass; there was no real tumor present there. Path report stated "Breast mass 9:00 excisional biopsy - angiolymphatic invasion by mammary carcinoma throughout the entire specimen."

Is this two primaries because of the two different histology codes: 8500 and 8010?

 For cases diagnosed 2007 or later, abstract as a single primary using rule M3 (a single tumor is always a single primary). There was one tumor present according to the information provided. The second specimen was not a separate tumor ("There was no real tumor present there"). Breast N/A 2008
20081138 MP/H Rules/Histology--Lung: What is the correct histology code for a neuroendocrine neoplasm described as a carcinoid and also referred to as oncocytic? See Discussion.

Left mainstem bronchus mass excised: metaplastic endobronchial mucosa with submucosa containing an infiltrating poorly diff malignant tumor. Origin of tumor is not identified in overlying mucosa. IHC stains will be performed.

Addendum #1. IHC stains show well diff neuroendocrine neoplasm, favor carcinoid. Recommend sending this to expert in lung neoplastic pathologist.

Addendum #2. (lung path specialist) oncocytic neuroendocrine neoplasm.

Is this 8246 or 8290 or something else?

 For cases diagnosed 2007 or later, code as 8246 [Neuroendocrine carcinoma, NOS]. According to our pathologist consultant, the neuroendocrine description is more specific than the oncocytic description in this case. Lung Histology 2008
20081058 Histology--Brain and CNS: How is the histology coded for a mixed glioneuronal tumor, such as a papillary glioneuronal tumor? The best code available at this time is 9505/1 [Ganglioglioma, NOS]. Brain and CNS Histology 2008
20081052 Histology: What is the histology code for a soft tissue thigh mass that was diagnosed as Ewing sarcoma/PNET, primitive neuroectodermal tumor?

The histologies stated for this case are Ewing sarcoma (9260) and PNET, primitive neuroectodermal tumor,(9364)*. Use the Other Site Rules, starting with H8. Stop at H17 and assign the higher histology code -- 9364/3 [Peripheral neuroectodermal tumor].

*The term "PNET" is used for two different tumors. One is primitive neuroectodermal tumor (9473) and pertains to brain tumors per ICD-O-3 review. The other is peripheral primitive neuroectodermal tumor (pNET or PPNET 9364) and pertains to bone or soft tissue tumors. This case is stated to be soft tissue and Ewing sarcoma, so it is 9364 rather than 9473.

 N/A Histology 2008
20081055 MP/H Rules--Melanoma: How many primaries are represented if subsequent to a diagnosis of malignant melanoma of skin of left thorax in April 2006, a metastatic melanoma is discovered in the soft tissue of the abdomen and in the skin and subcutaneous tissue of the groin in late 2007? See Discussion.

4/20/06: skin left lateral thorax, excision: Pedunculated malignant melanoma, 0.5 CM in height, Clark's level 3, Breslow depth 0.5 CM, superficial ulceration noted. No host response. Margins clear.

6/19/06: Four sentinel LNs negative. Interferon therapy.

10/30/07: FNA of soft tissue, left lower abdomen: consistent with metastatic melanoma.

12/20/07 A) sentinel lymph node, left groin, biopsy: No morphologic or immunophenotypic findings support for metastatic melanoma (see comment). B) skin and subcutaneous tissue, left groin, excisional biopsy: Metastatic malignant melanoma (see comment). Lymphovascular invasion identified. Margins free of melanoma. Melanoma 1.5 MM from the closest designated deep margin and 5 MM from the designated 6:00 margin. C) skin, left groin/additional inferior margin, excisional biopsy: No significant histopathologic abnormality. No evidence of villus or melanoma or malignancy. Comment: A 0.8 cm metastatic nodular melanoma is present in the adipose tissue. The underlying skin is unremarkable. There is no evidence of ulceration, melanocytic lesion, melanoma in situ, or regression of melanoma. Block A1 is sent for immunohistochemical studies. The immunophenotypic findings provide no support for metastatic melanoma in lymph node. Please see the immunohistochemical study. The primary MD states "Recurrent intransit mets, left groin."

 For cases diagnosed 2007 or later, this is a single primary, melanoma of the thorax 4/20/06. The subsequent reports mention metastases, but do not document another primary. Do not count metastatic lesions as new primaries. Melanoma N/A 2008
20081008 Surgery of Primary Site--Breast: How is this field coded when a re-excision follows a prior mastectomy?

Code the most extensive surgery in Surgery of Primary Site. This is a cumulative field. Assign the appropriate code including all surgeries of the primary site performed during the first course of treatment.

The correct code for mastectomy followed by re-excision will depend on the extent of the re-excision. For example, if the re-excision removed muscle, code radical mastectomy.

 Breast Surgery of Primary Site 2008