A taller-than-wide (TTW) shape is a suspicious feature of thyroid nodules commonly defined as an anteroposterior/transverse diameter (AP/T) ratio >1. An intraobserver variability of up to 18% in AP diameter evaluations has been described, which may lead to overreporting of this feature.
To potentially improve the reliability of the TTW definition, we propose an arbitrary ratio of ≥1.2.The aim of this study was to estimate the impact of this definition on diagnostic performance.We prospectively analyzed 553 thyroid nodules referred for cytology evaluation at an academic center.
Before fine-needle aspiration, two examiners jointly defined all sonographic features considered in risk stratification systems developed by the American Thyroid Association (ATA), the American Association of Clinical Endocrinologists (AACE), the American College of Radiology (ACR TIRADS), the European Thyroid Association (EU-TIRADS), and the Korean Society of Thyroid Radiology (K-TIRADS).
[Linking template=”default” type=”products” search=”HR0005-6″ header=”2″ limit=”150″ start=”2″ showCatalogNumber=”true” showSize=”true” showSupplier=”true” showPrice=”true” showDescription=”true” showAdditionalInformation=”true” showImage=”true” showSchemaMarkup=”true” imageWidth=”” imageHeight=””]
TTW was defined according to the current definition (AP/T diameter ratio >1) and an arbitrary alternative definition (AP/T ratio >1.2).