title: Riedel's thyroiditis: clinical, pathological and imaging features.
abstract: Riedel's thyroiditis (RT) is an extremely rare form of chronic thyroiditis, characterised by a fibroinflammatory process which partially destroys the thyroid, often involving surrounding tissues. We describe an unusual case of RT in a 38-year-old woman, and discuss its typical clinical, pathological, ultrasound, radionuclide scanning and magnetic resonance findings. We conclude that the diagnosis of RT is highly suggestive in the presence of a hard gland (or nodule), fixed to adjacent structures; 'cold' on Tc99 scan; hypoechoic with absence of vascular flow, invading the adjacent neck structures on ultrasound; hypointense in T1- and T2-weighted MR images; and showing fibrous tissue fragments with inflammatory cells at cytological examination. Thyroidectomy has to be performed to confirm the diagnosis and to relieve pressure symptoms.
authors.affiliation: Hesperia Tiroide Centre, Hesperia Hospital, Modena, Italy.
authors.forename: G
authors.initials: G
authors.lastname: Papi
authors.forename: S
authors.initials: S
authors.lastname: Corrado
authors.forename: A M
authors.initials: AM
authors.lastname: Cesinaro
authors.forename: L
authors.initials: L
authors.lastname: Novelli
authors.forename: A
authors.initials: A
authors.lastname: Smerieri
authors.forename: C
authors.initials: C
authors.lastname: Carapezzi
mesh_terms: D000328:Adult; D001707:Biopsy, Needle / Q000379:methods; D005260:Female; D006801:Humans; D008279:Magnetic Resonance Imaging / Q000379:methods; D016606:Thyroid Nodule / Q000175:diagnosis; D013965:Thyroidectomy / Q000379:methods; D013967:Thyroiditis, Autoimmune / Q000175:diagnosis* / Q000601:surgery