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. 2020 Mar 26;10(4):180. doi: 10.3390/diagnostics10040180

Table 3.

Proposed algorithm for US classification of thyroid nodules, including Volumetric Color Doppler evaluation. Adapted from French TI-RADS, Russ, 2016 [21].

Category French TIRADS + 4D Color Doppler
1 No nodules
2 Cyst/Isolated macrocalcification/Spongiform
3 Oval, regular margins, iso/hyperechoic
4A Oval, regular margins, mild hypoechoic
4B High suspicion features (1 or 2):

  • Taller-than-wide

  • Irregular margins

  • Marked hypoechoic

  • Microcalcifications

  • Stiff on elastography (quantitative SE: SR > 4)

  • Increased intranodular vascularity/interrupted capsule (3D CD assessment)
5 High suspicion features (3–6)
and/or Lymph node metastasis