Riedel thyroiditis
Riedel thyroiditis is a rare benign pathology of the thyroid gland.
It is also known as invasive fibrous thyroiditis.[1]
General
Clinical features:[1]
- Extremely rare.
- Women > men.
- Usually smokers.
- May be associated with retroperitoneal fibrosis.
- May be hypothyroid.
- +/-Obstructive symptoms.
Microscopic
Features:
- Fibrosis.
- Specimen often fragmented as it was difficult to remove.
DDx:
- Anaplastic carcinoma, spindle cell variant.
- Multifocal fibrosing thyroiditis.