Thyroid nodules are exceedingly common, leading to costly interventions for many lesions that are ultimately proven to be benign.

In response, ACR formed a committee with three goals:

  

  1. Develop management guidelines for nodules that are discovered incidentally on CT, MRI, PET, or ultrasound.
  2. Produce a lexicon to describe all thyroid nodules on sonography. Terms were chosen after an exhaustive literature review to maximize their ability to distinguish benign from malignant nodules.
  3. Develop a standardized risk stratification system called the Thyroid Imaging, Reporting and Data System (TI-RADS) based on the lexicon to inform practitioners about which nodules warrant biopsy.