SEER Inquiry System - Search

Heme and Lymphoid Neoplasms/Multiple Primaries--Myeloproliferative Neoplasms:  Are essential thrombocytosis (ET) in 1998 and primary myelofibrosis in 2022 the same primary or is the 2022 diagnosis a new primary? See Discussion.

Solid Tumor Rules/Histology--Oropharynx:  How is histology coded for a 2024 squamous cell carcinoma of the tonsil when immunohistochemistry (IHC) stains are negative for p16, but in situ hybridization (ISH) testing is positive for human papilloma virus (HPV)? See Discussion.

Solid Tumor Rules/Multiple Primaries--Bladder:  Urinary Sites Solid Tumor Rules (STRs), Rule M6, says to abstract multiple primaries when an invasive tumor occurs more than 60 days after an in situ tumor. Does that 60-day interval apply to the original diagnosis date, or to the latest recurrence? See Discussion.

Solid Tumor Rules/Histology--Head & Neck:  How is histology coded for nasopharyngeal non-keratinizing squamous cell carcinoma, undifferentiated type? See Discussion.

2024 SEER Manual/Reportability--Breast:  Is "lobular intraepithelial neoplasia" (LIN) a glandular intraepithelial neoplasia? If so, is lobular neoplasia II (LN II)/LIN II non-reportable, similar to PanIN II - SINQ 20240026? See Discussion.

SEER Manual/Reportability--Vulva:  Is vulvar intraepithelial neoplasia (VIN II) alone reportable? An example is a final diagnosis from a pathology report that states only 'VIN II' with no additional details/wording.

2024 SEER Manual/Primary Site--Retroperitoneum: What is the primary site code for a final diagnosis of endometrioid adenocarcinoma from a biopsy of a right retroperitoneal mass? See Discussion. 

Reportability/Histology--Lung: Are adenocarcinoma spectrum lesions on lung imaging reportable when no further information is available? See Discussion.

Reportability/Histology--Conjunctiva: Is low-grade conjunctival melanocytic intraepithelial lesion (LG-CMIL) with focal high-grade features of the conjunctiva (C690) reportable? If reportable, what histology should be assigned?

Reportability/Histology--Endometrium: Are the following terms and diagnoses synonymous with endometrioid intraepithelial neoplasia (EIN) and therefore reportable?

1. Atypical glandular epithelium

2. Isthmic-type mucosa with focal severe atypia

3. Simple hyperplasia without atypia

4. EIN/complex atypical hyperplasia (EIN/CAH) or focal EIN/CAH (on biopsy but the resection pathology or operative note states no   EIN/CAH/atypical hyperplasia)