Incidental findings of the thyroid gland on PET-CT

ARTICLE TITLE: Incidental findings of the thyroid gland on PET-CT.

AUTHORS: Suchilova M.M.1, Korkunova O. A.1, Nikolaev A. E.2, Grishkov S.M.2., Bosin V.Yu.2.


  2. Research and Practical Clinical Center of Diagnostics and Telemedicine Technologies, Department of Health Care of Moscow, Russia


Incidental findings of the thyroid gland are common on the whole-body FDG (18F- flurodeoxyglucose) positron emission tomography-computed tomography (PET-CT).

Materials and Methods:

A retrospective review of 100 patients with breast cancer (AJCC IV) was done. PET-CT studies with incidental focal and diffuse FDG thyroid uptake formed the review basis. These studies were performed within a period of 12 months (January 1, 2016-December 31, 2016). Twenty two (n=22) patients out of 100 (22%) had FDG thyroid uptake and comprised the study group. We excluded patients who had a history of previous thyroid malignancy or predisposing causes (e.g., Cowden syndrome).

Scans were acquired approximately 60 min after the injection of 555MBq (15mCi) FDG with the Gemini TF PET/CT (Philips Medical Systems, Cleveland, Ohio, USA) scanner with a 16-slice Brilliance CT.


This study shows that thyroid FDG uptake, incidentally identified on PET/CT of patients with breast cancer (AJCC - IV), occurred at a frequency of 22%. Focal and diffuse types of uptake were diagnosed with equal frequency.


However, well-defined criteria for evaluating thyroid incidentalomas on PET examinations aren’t developed yet and ultrasound still remains the method of choice for analyzing thyroid changes

KEYWORDS: incidentaloma, PET-CT, thyroid gland, FDG-uptake, petoma CORRESPONDING AUTHOR: Suchilova M.M.


FOR CITATIONS: Suchilova M. M.1. Korkunova O. A.1. Nikolayev A.E.2. Grishkov S.M.2. Bosin V.Yu.2. - Incidental findings of the thyroid gland on PET-CT // Radiology Study. - 2019. - T1., No1. - p.7-15

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