SEER Inquiry System - Search

Histology (Pre-2007)--Pancreas: Should pancreatic neoplasia III (PanIN III) be coded to 8010/2 [carcinoma in situ, NOS] or 8500/2 [Ductal carcinoma in situ]? See Description.

Histology (Pre-2007)--Skin: Are "atypical melanocytic hyperplasia" and "severe melanotic dysplasia" synonyms for melanoma in situ?

Histology (Pre-2007)/Multiple Primaries (Pre-2007)--Breast: How is the histology of invasive small cell carcinoma of lobular histogenesis coded?

Could high grade ductal carcinoma in situ, comedo type be a recurrence of ductal carcinoma diagnosed 18 years earlier?

Is "invasive small cell carcinoma of lobular histogenesis, high grade ductal carcinoma in situ, comedo type" one or two primaries? See Description.

Histology (Pre-2007)/Primary Site/Diagnostic Confirmation: How would these fields be coded for a diagnosis of cholangiocarcinoma based on clinical findings only? See Discussion.

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

Histology (Pre-2007): What code is used to represent the histology "adenocarcinoma, undifferentiated, with sarcomatoid features"? 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--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--Brain and CNS: What is the histology code of a primary papillary epithelial tumor of the sella (PPETS)?  See Discussion.

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