An ultrasound examination was performed of the normal thyroid in 300 patients (164 males and 136 females). Small echoic nodules were demonstrated in 19% of the patients and fluid-filled masses in 6%. Echoic nodules occurred frequently (greater than 40%) in the seventh decade. 71% of the nodules were situated in the right lobe.
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Woestyn et al. (1985) studied this question.
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