Radioiodine sinus uptake related to mucosal thickening or aspergilloma: a case series of an unrecognized event well evidenced by SPECT/CT. Issue 1 (December 2017)

• Record Type: Journal Article
• Authors: Ciappuccini, Renaud; Blanchard, David; Rame, Jean-Pierre; de Raucourt, Dominique; Babin, Emmanuel; Bardet, Stéphane
• Is Part Of: Cancer imaging. Volume 17:Issue 1(2017)
• Page Start: 1
• Page End: 6
• Publication Date: 2017-12
• Subjects: Differentiated thyroid cancer -- Radioiodine -- SPECT/CT -- Sinus -- Aspergilloma -- Case report; Cancer -- Imaging -- Periodicals; 616.994075405
• DOI: 10.1186/s40644-016-0105-1
• Languages: English
• ISSNs: 1740-5025

Abstract

Abstract Background False-positive radioiodine (RAI) uptake related to chronic sinusitis and mucocele has only rarely been reported in patients with differentiated thyroid cancer (DTC) even with the recent use of single photon emission tomography with computed tomography (SPECT/CT) acquisition. No other etiology of sinus RAI uptake has been mentioned to date. Objectives We report five cases of DTC patients with sinus RAI uptake on post-RAI scintigraphy. SPECT/CT clearly localized RAI uptake either in the sphenoid, the maxillary or the frontal sinus and highly suspected mucosal thickening in four patients and sinus aspergilloma in one patient. Conclusion These data confirm the possibility of false-positive sinus RAI uptake, provide a new cause of such benign uptake, i.e. sinus aspergilloma, and demonstrate the clinical relevance of head and neck SPECT/CT acquisition in the diagnosis of such uptake. Nuclear medicine physicians should be aware of this pitfall when interpreting post-RAI scintigraphy.