SEER Inquiry System - Question 20210060 Details

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Produced: 08/17/2025 12:09 PM

Question 20210060

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Inquiry Details

References:

#1: 2021 SEER Manual, 6. Reportability

#2: ICD-O-3.2

Question:

Reportability/Histology--Thymus: Is a 2021 diagnosis of a type A microscopic thymoma reportable? See Discussion.

Discussion:

ICD-O-3.2 lists microscopic thymoma as benign (8580/0) and thymoma, type A as malignant (8581/3).

January 2021: Left central neck node dissection for thyroid carcinoma with thymic tissue showing an incidental type A microscopic thymoma, described as a small (<0.2 cm) focus. Diagnosis comments further indicate this is morphologically consistent with a microscopic thymoma (type A).

Answer:

Report this case as type A thymoma. We consulted an expert physician and his advice on this specific case is to interpret it as a malignancy and report.

Use text fields to record the details of this case.

Cancer Site Category:

N/A

Data Item Category:

Histology

Other Category:

Reportability

Year:

2021