Systems Pathology Exam 1 Practice

Riedel thyroiditis is characterized by which finding?

Dense fibrosis of the thyroid gland Acute lymphocytic infiltration Hemangioma of thyroid Cystic degeneration with calcifications

Correct Answer:

Dense fibrosis of the thyroid gland

Explanation:

Riedel thyroiditis is defined by replacement of the thyroid tissue with dense fibrous (fibroinflammatory) tissue that often extends beyond the thyroid capsule into surrounding neck structures. This extensive fibrosis gives the thyroid a hard, “woody” feel and can cause compressive symptoms. That dense fibrosis of the gland is the hallmark finding. Hashimoto thyroiditis, in contrast, shows lymphocytic infiltration with germinal centers rather than widespread fibrosis. A hemangioma is a vascular tumor, not a fibrosing process. Cystic degeneration with calcifications is more typical of other nodular or degenerative thyroid conditions, not Riedel’s.

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