Table 1 Inclusion and exclusion criteria

Histologically confirmed MTC (surgical thyroidectomy or fine needle aspiration)

Unenhanced acquisition of the MRI scan (due to contraindications to gadolinium-based contrast agents, such as acute or chronic renal failure with estimated glomerular filtration rate < 30 mL/min or known hypersensitivity)

Whole-body ¹⁸F-DOPA PET/CT between 2010 and 2016

MRI contrast agent other than gadoxetic acid

Matching gadoxetic acid-enhanced liver MRI within 30 days

Unenhanced CT (due to contraindications for iodinated contrast agents, such as manifest hyperthyroidism, acute or chronic renal failure with estimated glomerular filtration rate < 30 mL/min or known hypersensitivity)

Missing or inconclusive histological results confirming the diagnosis of MTC