Pediatric Thyroid Nodules: Ultrasound Characteristics as Indicators of Malignancy.

Objective: Pediatric thyroid nodules are uncommon but carry a 25% malignancy risk. Adult patients have well-established ultrasound characteristics that are predictive of malignancy, but these are not clearly defined in pediatric patients. We reviewed a case series of pediatric thyroid nodules. Study Design: Retrospective chart review. Setting: Tertiary children's hospital. Method: Institutional review board approval was obtained. This case series with chart review includes all pediatric thyroid nodules with ultrasounds from 2006 to 2016 at 2 pediatric tertiary care centers. Results: An overall 112 pediatric thyroid nodules were analyzed. The mean patient age was 14.3 years; there was a female:male ratio of 4:1; and 94% were Caucasian. Seventeen percent (20/112) of nodules were malignant. In patients with malignant nodules, the average presenting age was 15.5 years, with a female:male ratio of 5.6:1. Seventy percent of malignant nodules had accompanying microcalcifications, 55% had abnormal lymph nodes, and 45% had irregular margins. In the benign nodules, 11% had microcalcifications, 12% had abnormal lymph nodes, and 26% had irregular margins. The presence of microcalcifications (odds ratio, 19.1 [95% CI, 6.0-61.0]; Conclusions: Our data suggest that abnormal lymph nodes, microcalcifications, and size >3.5 cm could be predictors of malignancy in the pediatric population and influence clinical decision making.