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[Echo Doppler in the characterization of thyroid nodular disease]
G Argalia1, F D'Ambrosio, F Lucarelli
1USL 12, Istituto di Semeiologia, Diagnostica e Terapia Strumentale, Università degli Studi di Ancona.
La Radiologia Medica
|May 1, 1995
Summary
Color-Doppler ultrasound effectively characterizes thyroid nodules by analyzing vascular patterns, peak velocity, and resistive index. These Doppler parameters aid in selecting patients for fine-needle biopsy, improving diagnostic accuracy.
Area of Science:
- Radiology
- Endocrinology
- Oncology
Background:
- Thyroid nodules are common, and accurate characterization is crucial for appropriate management.
- Conventional B-mode ultrasound has limitations in differentiating benign from malignant thyroid nodules.
- Color-Doppler ultrasound offers additional information about nodule vascularity, potentially improving diagnostic precision.
Purpose of the Study:
- To investigate the role and efficacy of color-Doppler ultrasound in characterizing thyroid nodules.
- To evaluate specific Doppler parameters, including vascular patterns, peak velocity (Vp), and resistive index (RI), in distinguishing between different types of thyroid nodules.
- To determine the utility of color-Doppler ultrasound in selecting patients for fine-needle biopsy.
Main Methods:
- Eighty-three patients with a single solid thyroid nodule (≥0.8 cm) underwent scintigraphy, laboratory tests, color-Doppler ultrasound, and fine-needle biopsy/histology.
- Color-Doppler ultrasound parameters analyzed included nodule vascularization patterns (Type I, II, III), peak systolic velocity (Vp), and resistive index (RI).
- B-mode ultrasound variables such as size, site, margins, calcifications, halo sign, invasion, and adenopathy were also assessed.
Main Results:
- Three vascular patterns were identified: Type I (avascular) in hyperplasia, Type II (peripheral) in hyperplasia/adenomas, and Type III (peri- and intranodular) in adenomas and carcinomas.
- Hyperplasias typically showed Type I or Type II vascularization with Vp < 50 cm/s and RI ≤ 0.75.
- Adenomas and carcinomas were always vascularized; carcinomas showed variable distribution, Vp < 50 cm/s with RI > 0.75, while Vp ≥ 50 cm/s had RI independent of the 0.75 threshold.
Conclusions:
- Vascular patterns alone are not highly effective in differentiating thyroid nodules compared to B-mode ultrasound.
- Peak velocity (Vp) and resistive index (RI) are valuable parameters for characterizing solid thyroid nodules.
- Color-Doppler ultrasound, particularly Vp and RI, aids in selecting patients who would benefit most from fine-needle biopsy.