SEER Inquiry System - Search

Histology--Head & Neck: Why is 8070 not listed as a valid histology for ill-defined sites as squamous cell carcinoma arises in the head and neck sites. See Discussion.

Histology--Corpus uteri: Is 8020/3 used for a predominantly dedifferentiated carcinoma with focal well-differentiated endometrioid adenocarcinoma diagnosed in 2018? See Discussion.

Histology--Cervix: Can human papilloma virus (HPV) or p16 testing results from a non-reportable high-grade squamous intraepithelial lesion (HSIL)/cervical intraepithelial neoplasia  (CIN 3) pathology report be used to code histology as squamous cell carcinoma (SCC), HPV-positive (8085), if subsequent excision/resection identifies invasive SCC and no further HPV or p16 testing is done on the invasive specimen? See Discussion.

Histology--Breast: Please confirm the morphology code for a diagnosis of "encapsulated papillary carcinoma" of the breast. Several articles on the internet lead me to believe it is the same as an intracystic carcinoma, code 8504/2 (our case shows no evidence of invasion).

Histology--Brain and CNS: What morphology code should be assigned to a low-grade glial/glioneuronal neoplasm? See Discussion.

Histology--Brain and CNS: What is the histology code of a primary papillary epithelial tumor of the sella (PPETS)?  See Discussion.

Histology--Brain and CNS: Provide clarification about the priority order of histology coding sources and an explanation of why the annotated histology lists are not the same as the WHO IARC ICD-O-3.2 Excel Table (adopted 1/1/2021). See Discussion.

Histology (Pre-2007): What code is used to represent the histology adenocarcinoma with "areas of" papillary architecture and "foci of" squamous differentiation? Even though "areas of" and "foci" are non-majority terms, should histology be coded to the combination code of adenocarcinoma with mixed subtypes [8255/3]?

Histology (Pre-2007): What code is used to represent the histology "adenocarcinoma, undifferentiated, with sarcomatoid features"? See discussion.

Histology (Pre-2007)/Terminology: Are "pattern", "architecture", and "architectural pattern" terms that indicate a majority of tumor?