Fig. 1From: A computer-aided diagnosing system in the evaluation of thyroid nodules—experience in a specialized thyroid centerGrayscale and Doppler US examination of thyroid nodules. a, b A solid hypoechoic nodule with microcalcifications, a nonparallel pattern and low blood flow; c, d A well-defined heterogeneous nodule with macrocalcifications, a parallel pattern and high blood flow; e, f An ovoid to round hypoechoic nodule with low blood flowBack to article page