Long-Term Ultrasound Follow-Up of Thyroid Colloid Cysts
A 27-year-old woman with gradual increase in a thyroid colloid cyst. Preoperative longitudinal sonogram (a) shows a colloid cyst with an anechoic nodule and a comet-tail artifact in the left thyroid lobe (arrow, 3.2 mm at its largest diameter). Upon sequential US follow-ups, this colloid cyst demonstrates a gradual increase at a 1-year (b) (arrow, 3.5 mm at its largest diameter), a 3-year (c) (arrow, 4.7 mm at its largest diameter), and a 5-year (d) (arrow, 5.1 mm at its largest diameter) postlobectomy.
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