Thyroid Nodule Classification and Management

Characteristics of Thyroid Nodules

Bordered and regular nodules are associated with benign lesions and low risk of malignancy, as defined by the American College of Radiology 1
Partially cystic nodules have a lower risk of malignity compared to completely solid nodules, according to the American Thyroid Association 1
The absence of central vascularization on Doppler ultrasound is a reassuring finding, as central chaotic vascularization is a suspicious characteristic, as noted by the Society of Radiologists in Ultrasound 1

The TIRADS 3 classification is based on the nodule being heterogeneous with a cystic component but without defined suspicious ultrasound characteristics, as stated by the American College of Endocrinology 2
Fine-needle aspiration (FNA) is not recommended for TIRADS 3 nodules unless there are additional clinical risk factors, according to the American Thyroid Association 2
The current guidelines prioritize surveillance for nodules less than 1 cm without suspicious characteristics, and this conservative approach extends to larger TIRADS 3 nodules, as recommended by the Endocrine Society 3, 4

FNA is indicated if the patient has a history of cervical or cephalic irradiation, as recommended by the American College of Radiology 2
FNA is also indicated if the patient has suspicious cervical adenopathies, a subcapsular nodule location, or documented rapid growth during follow-up, according to the Society of Radiologists in Ultrasound 2

A follow-up ultrasound should be performed at 12 months to evaluate nodule stability, as recommended by the American Thyroid Association 2
If the nodule remains stable in size and ultrasound characteristics, surveillance should continue at 12-24 month intervals, according to the American College of Endocrinology 2