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  • Author: Cristiano Lomonaco x
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Giorgio Grani Department of Translational and Precision Medicine, “Sapienza” University of Rome, Rome, Italy

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Livia Lamartina Department of Translational and Precision Medicine, “Sapienza” University of Rome, Rome, Italy

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Valeria Ramundo Department of Translational and Precision Medicine, “Sapienza” University of Rome, Rome, Italy

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Rosa Falcone Department of Translational and Precision Medicine, “Sapienza” University of Rome, Rome, Italy

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Cristiano Lomonaco Department of Translational and Precision Medicine, “Sapienza” University of Rome, Rome, Italy

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Laura Ciotti Department of Translational and Precision Medicine, “Sapienza” University of Rome, Rome, Italy

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Martina Barone Department of Translational and Precision Medicine, “Sapienza” University of Rome, Rome, Italy

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Marianna Maranghi Department of Translational and Precision Medicine, “Sapienza” University of Rome, Rome, Italy

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Vito Cantisani Diagnostic and Ultrasound Innovations Unit, Azienda Ospedaliera Universitaria Policlinico Umberto I, “Sapienza” University of Rome, Rome, Italy

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Sebastiano Filetti Department of Translational and Precision Medicine, “Sapienza” University of Rome, Rome, Italy

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Cosimo Durante Department of Translational and Precision Medicine, “Sapienza” University of Rome, Rome, Italy

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Introduction: 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. Objective: The aim of this study was to estimate the impact of this definition on diagnostic performance. Methods: 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). TTW was defined according to the current definition (AP/T diameter ratio >1) and an arbitrary alternative definition (AP/T ratio >1.2). Results: The alternative definition classified fewer nodules as TTW (28, 5.1% vs. 94, 17%). The current and proposed definitions have a sensitivity of 26.2 and 11.9% (p = 0.03) and a specificity of 83.8 and 95.5% (p < 0.001). Thus, as a single feature, the arbitrary definition has a lower sensitivity and a higher specificity. When applied to sonographic risk stratification systems, however, the proposed definition would increase the number of avoided biopsies (up to 58.2% for ACR TIRADS) and the specificity of all systems, without negative impact on sensitivity or diagnostic odds ratio. Conclusions: Re-defining TTW nodules as those with an AP/T ratio ≥1.2 improves this marker’s specificity for malignancy. Using this definition in risk stratification systems will increase their specificity, reducing the number of suggested biopsies without significantly diminishing their overall diagnostic performance.

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