Interobserver Agreement Among Thyroid Ultrasound Operators in Defining Thyroid Nodules as Subcapsular
Authors' conclusion
The overall IOA among US experts when assessing TNs as subcapsular was unsatisfactory.
Study context
- Population
- 60 thyroid nodules from patients undergoing surgery and histological diagnosis, assessed by 12 thyroid ultrasound (US) experts with high or very high experience12 raters · 60 thyroid nodules (TNs)
- Outcome
- Overall interobserver agreement (Fleiss' kappa) in classifying TNs as subcapsular or not
Methodological detailsstatic US images, raters blinded to other TN characteristics, histologically confirmed cases, Two experienced operators selected the case series and analyzed the findings
- Static US images
- Raters blinded to other TN characteristics
- Histologically confirmed cases
- Two experienced operators selected the case series and analyzed the findings
Main finding
As reported in the abstract
Overall IOA (Fleiss' kappa)
Overall interobserver agreement (IOA), fair
κ = 0.34
Further findings
IOA in raters with higher experience
- IOA, raters with higher experience
- κ = 0.39
IOA in TNs of medium size
- IOA, medium-size TNs
- κ = 0.38
IOA in EU-TIRADS 5 TNs <2 cm
- Highest IOA across sub-analyses, EU-TIRADS 5 TNs smaller than 2 cm
- 0.46
Original publication
Interobserver Agreement Among Thyroid Ultrasound Operators in Defining Thyroid Nodules as Subcapsular. Thyroid. Published 25 August 2025. doi:10.
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