LAUSR

Objective Incidental thyroid nodules (ITNs) are common, and variability regarding follow-up and recommendation practices exist. The study purpose was to determine adherence to the American College of Radiology (ACR) ITN criteria and analyze recommendation outcomes. Methods ITNs listed in the impression section on computed tomography, magnetic resonance imaging, and positron emission tomography studies over a 6-month period were included. Report recommendations were compared with ACR white paper criteria for adherence (concordant recommendation) or nonadherence (discordant recommendation). Reader characteristics, further ITN workup, and pathology were recorded. A P value less than 0.05 was used for significance. Results Three hundred fifty patients (mean age, 64.6 years) were included with a median ITN size of 18-mm. Most nodules (289/350) were reported on computed tomography and were identified for follow-up due to size (235/350). Only 39 of 350 reports (11.1%) did not follow ACR recommendations. Patient age was significantly related to recommendation adherence (P < 0.05) as opposed to radiologist practice type (ie, community-based or academic) which was not. Nonadherence most often involved recommending ultrasound follow-up for nonactionable small ITNs. The rate of fine-needle aspiration biopsy from concordant ITNs was significantly higher than discordant ITNs (P < 0.05). Six patients, all with concordant recommendations, had malignant final pathology results. Conclusion Recommendation adherence to the ACR ITN criteria was high, approaching 90%. Nonadherence was mostly due to recommending thyroid ultrasound when not indicated and was correlated with a younger patient age. The rate of fine-needle aspiration biopsy stemming from nonindicated ultrasounds was significantly lower and did not result in the diagnosis of any malignancies.