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Table 1 TIRADS classification according to Russ and al [9, 13]

From: Ultrasonographic prevalence and characteristics of non-palpable thyroid incidentalomas in a hospital-based population in a sub-Saharan country

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