Fibroelastic pseudotumour elastofibroma dorsi detected by 18F-FDG PET/CT and by posttherapy radioiodine SPECT/CT

Publication date: Available online 16 May 2017
Source:Revista Española de Medicina Nuclear e Imagen Molecular
Author(s): M. Oporto, F. Cepa, N. Orta, S. Rubí, H. Navalón, C. Peña
Radioiodine uptake in the thyroid tissue, metastasis of differentiated thyroid cancer (DTC), and in other tissues, depends on the expression of sodium-iodide symporter (NIS). Vascular permeability, effusions, inflammation, and other mechanisms may also play a role in the accumulation of radioactive iodine. A 63-year-old woman underwent radioiodine therapy, as well as a post-therapy whole-body scan,as she was suspected of having lung metastasis from thyroid carcinoma. The scan not only showed uptake at the lung metastasis but also a faint diffuse bilateral uptake in the posterior thorax. On SPECT/CT this uptake was located in a known ElastofibromaDorsi (ED) previously diagnosed by contrast CT and viewed in a FDG PET/CT. The radioiodine uptake in ED, especially if typical, is not a diagnostic problem in SPECT/CT study, but can be misleading in a study limited to a few planar images, particularly if the uptake occurs asymmetrically, or ED is located in a unsuspected area.



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