title: Usefulness of (18)F-FDG PET/CT in a rare case of malignant pseudothyroiditis.
abstract: We report an unusual case of malignant pseudothyroiditis (MPT) occurred in a 35-year-old female patient presenting with symptoms and signs of thyroiditis. Fine-needle aspiration biopsy of the thyroid demonstrated the presence of a MPT induced by a metastatic extrathyroidal carcinoma. F-FDG-PET/CT showed increased radiopharmaceutical uptake in the thyroid, in multiple cervical and mediastinal lymph nodes, and in a right pulmonary nodule. Histological examination demonstrated the presence of a metastatic non-small cell lung cancer (NSCLC). In this unusual case of MPT F-FDG-PET/CT has been useful in staging the disease and in detecting the primary tumor site.
authors.affiliation: From the Institutes of *Nuclear Medicine, †Radiology, and ‡Pathology, Catholic University of the Sacred Heart, Rome, Italy.
authors.forename: Giorgio
authors.initials: G
authors.lastname: Treglia
authors.forename: Annemilia
authors.initials: A
authors.lastname: Del Ciello
authors.forename: Guido
authors.initials: G
authors.lastname: Fadda
authors.forename: Maria Lucia
authors.initials: ML
authors.lastname: Calcagni
mesh_terms: D000328:Adult; D002289:Carcinoma, Non-Small-Cell Lung / Q000175:diagnosis* / Q000000981:diagnostic imaging; D003937:Diagnosis, Differential; D005260:Female; D019788:Fluorodeoxyglucose F18; D006801:Humans; D008175:Lung Neoplasms / Q000175:diagnosis* / Q000000981:diagnostic imaging; D064847:Multimodal Imaging; D049268:Positron-Emission Tomography; D013966:Thyroiditis / Q000175:diagnosis*; D014057:Tomography, X-Ray Computed
chemical_list: D019788:Fluorodeoxyglucose F18