What imaging study can be used to identify a thyroid nodule?

Ultrasound is the preferred imaging study for evaluating thyroid nodules because it provides detailed images of the thyroid gland and can accurately assess nodule size, characteristics, and the surrounding structures. Ultrasound is non-invasive, does not involve ionizing radiation, and is particularly useful for differentiating between solid and cystic nodules. It can also help detect additional nodules that may not be palpable on physical examination.

In addition to identifying the presence of a nodule, ultrasound can guide fine-needle aspiration biopsies, which are critical for further evaluation of the nodule's nature (benign vs malignant). The resolution of ultrasound allows for real-time imaging, providing accurate measurements and dynamic assessments of the nodule during follow-up.

While other imaging modalities like CT and MRI can also be used in certain situations, they are not the first line for thyroid nodule evaluation. CT scans involve exposure to radiation and are less favorable for examining soft tissue structures like the thyroid. MRI, although it provides detailed images, is typically reserved for cases where further evaluation of adjacent structures is required or when contraindications to other imaging occur. An X-ray provides too little detail and is not suitable for the assessment of thyroid nodules. Therefore, ultrasound stands out as the optimal initial