Differentiated Thyroid Cancer: Management of Patients with Radioiodine Nonresponsive Disease
Table 1
Imaging modalities for RAI-refractory recurrent disease.
Imaging study
Utility
Pros
Cons
Ultrasound neck
Detection of neck disease
Sensitive; ability to biopsy
Operator dependent; difficult to detect invasive disease and disease in the posterior neck
CT
Detection of local and metastatic disease
Sensitive; less operator dependent
Radiation exposure; risk of renal injury with contrast; delays in radioiodine administration
MRI
Detection of local and metastatic disease
Sensitive for CNS disease; no radiation exposure
Difficult to tolerate in some patients; risk of nephrogenic systemic fibrosis (NSF) in patients with renal failure; contraindicated in patients with certain metal devices or implants
FDG-PET scan
Detection of metastatic disease and providing prognostic information