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SEER Inquiry System - Report
Produced: 02/11/2026 1:53 AM
Question 20250031
Inquiry Details
References:
#1: 2025 SEER Manual. Reportability section
#2: WHO Class H & N Tumors. Oral Cavity
Question:
SEER Manual/Reportability/Histology: Is severe dysplasia reportable? This is commonly listed as a synonym for high grade dysplasia. Is this term "severe dysplasia" reportable in the sites where high grade dysplasia is reportable? This is listed as a synonym, but it is not clear. See Discussion.
Discussion:
We are seeing cases on this in head and neck. The College of American Pathologists Oral Cancer Protocol is showing this as keratinizing dysplasia, severe (carcinoma in situ) and nonkeratinizing dysplasia, severe (carcinoma in situ). SINQ Question 20230047 shows it as reportable for head and neck.
Answer:
Report severe dysplasia for selected sites. Not all high grade dysplasia and severe dysplasia are reportable. Refer to the list of examples in the SEER Manual Reportability Section and Appendix E, Reportable and Non-reportable Examples. Check also for other standard setters, state, and local reportability requirements.
High grade dysplasia, severe dysplasia, and carcinoma in situ are equivalent terms with behavior /2. Refer to ICD-O, WHO Classification of Tumors, and the SEER Solid Tumor Rules for preferred histology terms and codes. For example, WHO Classification of Head and Neck Tumors, 5th edition, states carcinoma in situ in the oral cavity is synonymous with severe dysplasia though it is not a recommended term.
