Riedel's thyroiditis diagnostic criteria

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Overview

Diagnostic criteria of Riedel's thyroiditis is based on the histopathological findings and includes infiltration of inflammatory cells in the thyroid gland, extension beyond the capsule, evidence of occlusive phlebitis and absence of giant cells, lymphoid follicles, oncocytes, or granulomas.

Diagnostic criteria

Definitive diagnosis of Riedel's thyroiditis is made only with histopathology, after an open biopsy or decompressive goiter surgery performed for clinical symptoms. Specific histopathological criteria required to establish the diagnosis of Riedel’s thyroiditis is:

1. Inflammatory process in the thyroid with extension into surrounding tissue.
2. The inflammatory infiltrate should contain no giant cells, lymphoid follicles, oncocytes, or granulomas.
3. Evidence of occlusive phlebitis.
4. No evidence of thyroid malignancy.