title: Thyroiditis: clinical aspects and diagnostic imaging.
abstract: Thyroiditis belongs to a heterogeneous group of inflammatory thyroid diseases. Hashimoto's thyroiditis, has an autoimmune pathogenesis: patients can be euthyroid or develop hypothyroidism, but may also experience transient thyrotoxicosis. Silent and postpartum thyroiditis also recognize an autoimmune origin; their clinical course being characterized by transient thyrotoxicosis occurring either sporadically or post-partum. Subacute thyroiditis is a painful, inflammatory disease of viral origin. Acute thyroiditis is a rare, serious, bacterial inflammatory disease. Riedel's thyroiditis is a rare chronic inflammatory disorder of unknown etiology, characterized by dense thyroid fibrosis. A diffuse thyroid hypoechogenicity is the hallmark of Hashimoto's thyroiditis, due to extensive lymphocytic infiltration of the gland. In postpartum and silent thyroiditis a diffuse or multifocal hypoechogenicity is found, while subacute thyroiditis is characterized by multiple ill-defined and migrating hypoechogenic areas. Both in acute and Riedel's thyroiditis there is marked hypoechogenicity.
authors.affiliation: Dipartimento di Endocrinologia, Università di Pisa, Italy. pvitti@endoc.med.unipi.it
authors.forename: P
authors.initials: P
authors.lastname: Vitti
authors.forename: T
authors.initials: T
authors.lastname: Rago
authors.forename: G
authors.initials: G
authors.lastname: Barbesino
authors.forename: L
authors.initials: L
authors.lastname: Chiovato
mesh_terms: D000293:Adolescent; D000328:Adult; D002648:Child; D003952:Diagnostic Imaging; D005260:Female; D006801:Humans; D008297:Male; D011247:Pregnancy; D011248:Pregnancy Complications / Q000175:diagnosis; D013966:Thyroiditis / Q000175:diagnosis*