Thyroid Ultrasound: Found a Nodule? Here Is What You Should Know

Your doctor felt something on your neck, or a nodule showed up on another scan. Now you are getting a thyroid ultrasound. Before you worry, here is what you need to know: thyroid nodules are incredibly common, and the vast majority are completely harmless.

How Common Are Thyroid Nodules?

Studies using ultrasound find nodules in up to 65% of the general population. Most of these are never noticed and never cause problems. Only about 5-10% of thyroid nodules turn out to be cancerous, and most thyroid cancers are highly treatable.

What Does Thyroid Ultrasound Show?

Ultrasound is the best imaging tool for evaluating the thyroid because it shows the size and exact location of nodules, whether a nodule is solid, fluid-filled (cystic), or mixed, the number of nodules present, blood flow patterns within and around nodules, and characteristics that suggest whether a nodule is likely benign or suspicious.

How Nodules Are Classified: TI-RADS

Radiologists use a scoring system called ACR TI-RADS thyroid nodule classification system (Thyroid Imaging Reporting and Data System) to classify nodules based on their ultrasound appearance:

• TR1: Benign — No further evaluation needed
• TR2: Not suspicious — No biopsy needed
• TR3: Mildly suspicious — Biopsy if 2.5 cm or larger; follow-up imaging if 1.5 cm or larger
• TR4: Moderately suspicious — Biopsy if 1.5 cm or larger; follow-up if 1.0 cm or larger
• TR5: Highly suspicious — Biopsy if 1.0 cm or larger; follow-up if 0.5 cm or larger

Suspicious vs. Reassuring Features

Features that are reassuring (likely benign): - Purely cystic (fluid-filled) nodules - Spongiform appearance (like a sponge) - Smooth, well-defined borders

Features that raise concern: - Solid and hypoechoic (darker than surrounding tissue) - Irregular or lobulated margins - Taller-than-wide shape - Microcalcifications (tiny bright spots) - Extra-thyroidal extension

What If a Biopsy Is Recommended?

A thyroid fine-needle aspiration (FNA) biopsy is a quick, minimally invasive procedure performed under ultrasound guidance. A thin needle is inserted into the nodule to collect cells for analysis. It takes about 10-15 minutes and is performed in our office. Most patients describe it as less painful than a blood draw.

Monitoring Over Time

Many nodules are simply monitored with follow-up ultrasounds at 6-12 month intervals. If a nodule remains stable in size and appearance over 2-3 years, the monitoring interval can be extended or discontinued.

Schedule Your Thyroid Ultrasound

Call (727) 398-5999 to schedule. The exam takes about 20-30 minutes and requires no preparation.