Table 1.

TIRADS classification according to Russ and al [9, 13]

TIRADS	Signification	Ultrasonographic characteristics	Malignancy risk (%)
TIRADS 1	Normal thyroid	▪ Normal thyroid US	-
TIRADS 2	Benign aspects	▪ Simple cyst ▪ Spongiform nodule ▪ ‘White knight’ aspect ▪ Isolated macrocalcification ▪ Typical sub-acute thyroiditis	0.0
TIRADS 3	Probably benign aspects	▪ None of the high suspicious aspect ▪ Isoechogenic ▪ Hyperechogenic	0.25
TIRADS 4A	Low suspicious aspect	▪ None of the high suspicious aspect ▪ Moderately hypoechogenic	6.0
TIRADS 4B	High suspicious aspects with 1 or 2 signs and no adenopathy	▪ Taller-than-wide shape ▪ Irregular or microlobulated margins ▪ Microcalcifications ▪ Marked hypoechogenicity	69.0
TIRADS 5	High suspicious aspects with ≥ 3 signs and/or adenopathy	▪ Taller-than-wide shape ▪ Irregular or microlobulated margins ▪ Microcalcifications ▪ Marked hypoechogenicity	100