SEER Inquiry System - Search

Solid Tumor Rules/Histology--Testis: Can a definition for "teratoma with somatic-type malignancy" (9084) be added to the Other Sites Solid Tumor Rules? See Discussion.

Solid Tumor Rules/Histology--Thyroid: What is the correct histology for invasive encapsulated follicular variant of papillary thyroid carcinoma (IEFVPTC)? The 2026 Solid Tumor Rules (STR) Manual, Other Sites Table 12, conflicts with the ICD-O-3.2. See Discussion.

Solid Tumor Rules/Histology--Thyroid: What is the histology code for a diagnosis of poorly differentiated thyroid carcinoma arising in a background of solid papillary thyroid carcinoma? See Discussion.

Solid Tumor Rules/Histology--Thyroid:  What is the correct histology code for a papillary carcinoma, encapsulated with columnar cell features?  See Discussion.

Solid Tumor Rules/Histology--Thyroid:  What is the correct histology code for the following thyroid primary with multiple tumors abstracted as one primary diagnosed prior to 2021?  See Discussion.

Solid Tumor Rules/Histology--Thyroid:  What is the histology code for sclerosing mucoepidermoid carcinoma with eosinophilla in the left thyroid and papillary thyroid carcinoma in the right thyroid?  See Discussion.

Solid Tumor Rules/Histology--Uterine Corpus:  How is histology coded for an epithelioid and myxoid leiomyosarcoma of the myometrium?  See Discussion.

Solid Tumor Rules/Histology--Vulva: Can instructions and descriptions from registry manuals be used to determine p16 status for the human papillomavirus (HPV)-related histology codes in the Solid Tumor Rules (STR)? Does it have to state that p16 is “positive” or “over-expressed” only? See Discussion.

Solid Tumor Rules/Histology/Behavior--Brain and CNS: How are histology and behavior coded when the Integrated Diagnosis is "Meningioma, WHO Grade 2," and the Histological Classification is "Meningioma with elevated mitotic activity, hypercellularity, necrosis, and sheeting architecture?" See Discussion.

Solid Tumor Rules/Histology: When should the designation of “poorly differentiated” be used to further specify histology for carcinoma, NOS (8010) as undifferentiated carcinoma (8020)? See Discussion.