Riedel thyroiditis

Riedel thyroiditis is a rare benign pathology of the thyroid gland.

It is also known as invasive fibrous thyroiditis.

General

Clinical features:

• 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.

See also

• Thyroid gland.