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2012, Number 4

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Anales de Radiología México 2012; 11 (4)

Prevalence of incidental nodular lesions of the thyroid gland in PET/CT studies in patients at the PET/CT cyclotron unit, UNAM School of Medicine

Bezaury RP, Contreras ZK, Orozco OÓ, García GJJ

Language: Spanish
References: 15
Page: 219-227
PDF size: 423.68 Kb.


ABSTRACT

Thyroid nodules are common, with 4-8% frequency by palpation in adults; between 30 and 50% are identified by ultrasound (US). In autopsies, nodules have been found in 50% of personas without preexisting thyroid disease.
The PET/CT study, which is performed to evaluate other carcinomas, can identify focal or diffuse uptake in this gland. When uptake is diffuse, it is usually attributed to thyroiditis. In contrast, when uptake is focal, it indicates probability of a carcinoma in between 30 and 50% of cases. “Incidental” findings in the thyroid gland have a prevalence of 1.2 to 4.3%. 14 to 50% are associated with risk of malignant thyroidal pathology. The maximum standardized uptake value (SUVmax) of malignant and benign lesions is highly variable, making differentiation based exclusively on that value nearly impossible.


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