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The nodule is a cyst. The risk of malignancy is <1%, indicating a benign finding. This nodule is benign.

benign

The nodule has microcalcifications, is hypoechoic, and has irregular margins. The risk of malignancy is >70–90%, indicating high suspicion for malignancy. This nodule is malignancy.

malignancy

The nodule is hypoechoic with irregular margins. The risk of malignancy is >70–90%, indicating high suspicion for malignancy. This nodule is malignancy.

malignancy

The nodule is hypoechoic with a taller-than-wide shape. The risk of malignancy is >70–90%, indicating high suspicion for malignancy. This nodule is malignancy.

malignancy

The nodule is hypoechoic, has irregular margins, and shows extrathyroidal extension. The risk of malignancy is >70–90%, indicating high suspicion for malignancy. This nodule is malignancy.

malignancy

The nodule is hypoechoic, with interrupted rim calcification and soft tissue extrusion. The risk of malignancy is >70–90%, indicating high suspicion for malignancy. This nodule is malignancy.

malignancy

The nodule is hypoechoic, solid, and has a regular margin. The risk of malignancy is 10–20%, indicating intermediate suspicion for malignancy. This nodule is benign.

benign

The nodule is hypoechoic, solid, and has a regular margin. The risk of malignancy is 10–20%, indicating intermediate suspicion for malignancy. This nodule is benign.

benign

The nodule is hyperechoic, solid, and has a regular margin. The risk of malignancy is 5–10%, indicating low suspicion for malignancy. This nodule is benign.

benign

The nodule is isoechoic, solid, and has a regular margin. The risk of malignancy is 5–10%, indicating low suspicion for malignancy. This nodule is benign.

benign

The nodule is partially cystic with an eccentric solid area. The risk of malignancy is 5–10%, indicating low suspicion for malignancy. This nodule is benign.

benign

The nodule is partially cystic with an eccentric solid area. The risk of malignancy is 5–10%, indicating low suspicion for malignancy. This nodule is benign.

benign

This nodule shows Gross Extrathyroidal Extension, in which the nodule extends through the thyroid capsule with frank invasion of adjacent soft tissue, strap muscles, or vascular structures. The reported risk of malignancy is approximately 100%. The image depicts a lobulated nodule protruding into and invading the anterior musculature .This nodule is malignancy.

malignancy

This nodule is irregular margin.Obviously discernible, but non-smooth edge, including microlobulation (small, undulating circles along the edge of the nodule) or spiculation (serrated or sharp projecting lines forming the edge). Risk of malignancy 32.1–86.7%. The nodule’s border demonstrates multiple spiculations and undulations (arrowheads).This nodule is malignancy.

malignancy

This nodule is Markedly Hypoechoic. Echogenicity is less than or equal to that of the anterior neck muscles, with a risk of malignancy of 57.0%. The nodule (arrowheads) appears darker than the neck muscles (M). This nodule is benign.

benign

This nodule has Punctate Echogenic Foci, which are punctate (≤1 mm) hyperechoic foci within the solid components of a nodule, with a reported risk of malignancy ranging from 16.8% to 77.9%. The image shows multiple minute echogenic foci (arrowheads) with no acoustic shadowing.This nodule is malignancy.

malignancy

This nodule is solid. This is a solid nodule with no obvious anechoic (cystic) portions. The risk of malignancy is 29.5–35.4%. This nodule is composed entirely of solid tissue and contains no fluid components. This nodule is benign.

benign

This nodule is taller-than-wide, meaning its anteroposterior diameter is greater than its transverse diameter when viewed in the transverse plane. The risk of malignancy is approximately 65.3–77.5%. The axial image shows a nodule whose AP dimension (arrows) is obviously greater than its transverse dimension (arrowheads).This nodule is malignancy.

malignancy

This nodule is hyperechoic.Increased echogenicity (brighter appearance) relative to the surrounding normal thyroid parenchyma. No specific risk of malignancy value is provided. The nodule (calipers) is more echogenic than adjacent normal tissue. This nodule is benign.

benign

This nodule has Peripheral (Rim) Calcifications, appearing as a curvilinear hyperechoic line completely or incompletely surrounding the nodule’s margin, possibly with posterior shadowing. The risk of malignancy is reported as 5.3%–57.7%. The lower pole nodule shows incomplete calcifications (arrowheads) along its border.

malignancy

This nodule is smooth margin.Obviously discernible smooth edge. Risk of malignancy N/A. The nodule has a sharp, curvilinear border (arrowheads) without spiculations or undulations.This nodule is benign.

benign

TThis nodule is spongiform.This is a spongiform nodule that is completely or nearly completely replaced by multiple cystic spaces separated by thin septa. The risk of malignancy is less than 1%. The nodule is essentially replaced by innumerable cystic spaces. This nodule is benign.

benign

This nodule shows Suspicious Minor Extrathyroidal Extension, defined by a loss of the echogenic thyroid border only, without definitive imaging evidence of invasion into adjacent tissues. Risk of malignancy is not available (N/A). The echogenic thyroid capsule is not visualized where the nodule abuts it (arrowheads).This nodule is malignancy.

malignancy

This nodule is wider-than-tall, meaning its anteroposterior diameter is equal to or smaller than its transverse diameter in the transverse plane. No specific risk of malignancy value is provided. The sonogram of the left lobe in the axial plane shows a nodule with a greater transverse dimension (+ calipers) than its AP dimension (× calipers).This nodule is benign.

benign

This nodule demonstrates Capsule Contact, in which the nodule touches the thyroid border with or without bulging it, but the echogenic capsule remains intact. The risk of malignancy is not available (N/A). The nodule (calipers) bulges the anterior capsule but does not obliterate it (arrowheads). The adjacent capsule is not seen because it is not orthogonal to the ultrasound beam .This nodule is benign.

benign

This nodule is ill-defined margin.Poorly demarcated border of the nodule that cannot be differentiated from the adjacent thyroid tissue. Risk of malignancy 14.8%. The nodule (arrowheads) is poorly demarcated from adjacent thyroid tissue.This nodule is benign.

benign

This nodule has Macrocalcifications, which are large (>1 mm) hyperechoic foci with posterior acoustic shadowing, carrying a risk of malignancy between 13.2% and 64.8%. The nodule (calipers) contains large calcific foci with an acoustic shadow (arrowhead).

benign

This nodule is mildy hypoechoic. Decreased echogenicity (darker appearance) compared to normal thyroid tissue but still brighter than the anterior neck muscles. The risk of malignancy is 19.9%. The nodule (calipers) is less echogenic than the parenchyma but more echogenic than the muscles (M). This nodule is benign.

benign

This nodule is Mixed Predominantly Solid.This is a nodule composed mostly of solid tissue with a fluid component comprising less than 50% of the total volume. The risk of malignancy is 8.2%. The nodule contains scattered cystic components (indicated by arrowheads). This nodule is benign.

benign

This nodule is anechoic. No internal echoes, indicating a cystic nodule. No specific risk of malignancy value is provided. The image shows absence of internal echoes in a fluid-filled area. This nodule is benign.

benign

This nodule has Echogenic Foci with Comet Tail, referring to echogenic foci that show comet-like echogenic tail artifacts (no specific risk of malignancy given). A colloid nodule can contain multiple echogenic foci, many of which exhibit comet-like artifacts (arrowheads).This nodule is benign.

benign

This nodule is Pure Cyst.This is a pure cyst composed of anechoic fluid without significant solid components, including septations or mural “lumps.” The risk of malignancy is approximately 0%. The nodule (calipers) contains only anechoic fluid. This nodule is benign.

benign

This nodule is isoechoic. Echogenicity similar to that of the surrounding normal thyroid tissue, with a risk of malignancy of 3.9%. The nodule (arrowheads) appears isoechoic to adjacent normal thyroid tissue. This nodule is benign.

benign

Mixed Predominantly Cystic.This is a nodule composed mostly of fluid, with the fluid component comprising more than 50% of the nodule’s volume. The risk of malignancy is 4.4%. Arrowheads denote the interface between the fluid and solid portions of the nodule. This nodule is benign.

benign

The nodule is spongiform. The risk of malignancy is <3%, indicating very low suspicion for malignancy. This nodule is benign.

benign

The nodule is partially cystic with no suspicious features. The risk of malignancy is <3%, indicating very low suspicion for malignancy. This nodule is benign.

benign

The nodule is partially cystic with no suspicious features. The risk of malignancy is <3%, indicating very low suspicion for malignancy. This nodule is benign.

benign

Predominantly solid and isoechoic nodule with focal minimal cystic changes (TIRADS 3, low suspicion). Diagnosis: benign follicular nodule.This nodule is benign.

benign

Predominantly solid and mildly hypoechoic nodule with focal minimal cystic change (TIRADS 3, low suspicion). Diagnosis: benign follicular nodule.This nodule is benign.

benign

Solid nodule with marked hypoechogenicity, which is hypoechoic relative to the anterior neck muscles, and punctate echogenic foci (TIRADS 5, high suspicion). Diagnosis: papillary carcinoma. This nodule is malignancy

malignancy

Solid nodule with marked hypoechogenicity, similar to the anterior neck muscles (TIRADS 4, intermediate suspicion). Diagnosis: papillary carcinoma. This nodule is malignancy.

malignancy

Solid nodule with mild hypoechogenicity (K-TIRADS 4, intermediate suspicion). Diagnosis: benign follicular nodule. This nodule is benign

benign

Solid and mildly hypoechoic nodule with punctate echogenic foci (TIRADS 5, high suspicion). Punctate echogenic foci with posterior acoustic shadowing are observed in the lower part of the nodule.This nodule is malignancy.

malignancy

Solid and mildly hypoechoic nodule with punctate echogenic foci (TIRADS 5, high suspicion). Punctate echogenic foci with posterior acoustic shadowing are observed in the lower part of the nodule.This nodule is malignancy.

malignancy

Solid and markedly hypoechoic nodule with punctate echogenic foci accompanying the comet-tail artifact (arrow) (TIRADS 5, high suspicion).This nodule is malignancy.

malignancy

Predominantly solid and markedly hypoechoic nodule with punctate echogenic foci accompanying the comet-tail artifact (thick arrow) (TIRADS 4, intermediate suspicion). US image shows irregular nodule margins (thin arrows).This nodule is malignancy.

malignancy

Nodule with intracystic echogenic foci and comet-tail artifact.Predominantly cystic and mildly hypoechoic nodule with intracystic echogenic foci showing comet-tail artifacts. Diagnosis: benign follicular nodule. This nodule is benign. ,0,benign fig5a.jpg,Loss of the perithyroidal echogenic line (arrows) at the site of contact with the thyroid cancer. Diagnosis: minor extrathyroidal extension.This nodule is malignancy."

malignancy

Loss of the perithyroidal echogenic line (arrows) at the site of contact with the thyroid cancer. Diagnosis: minor extrathyroidal extension.This nodule is malignancy.

malignancy

Thyroid cancer protruding into the strap muscle, with indistinct strap muscle margins. Diagnosis: gross extrathyroidal extension to the strap muscle.This nodule is malignancy.

malignancy

Ultrasonography feature of extrathyroidal extension of thyroid cancer to the trachea.An obtuse angle (white line) was formed between the surfaces of the trachea and thyroid cancer. Diagnosis: gross extrathyroidal extension to the tracheal wall.This nodule is malignancy.

malignancy

Ultrasonography feature of extrathyroidal extension of the thyroid cancer to the recurrent laryngeal nerve.Protrusion of thyroid cancer into the tracheoesophageal groove. Diagnosis:gross extrathyroidal extension to the recurrent laryngeal nerve.This nodule is malignancy.

malignancy