[Thyroglossal cyst of double cyst: one case report].

A 5 years old boy was referred to our department with complaints of a painless midline neck swelling. Clinical feature: there was a painless swelling above the middle of thyroid cartilage, it was about 2.0 cm x 0.5 cm, and it was soft. And its boundary was clear. The skin temperature is normal. B-mode ultrasound features: there is a cystic mass in the front of the neck, it is about 2.3 cm x 1.0 cm, and be apart from the skin is 0.3 cm. It is showed that another cystic mass behind this one, is about 1.9 cm x 0.7 cm. The borders are clear, and no blood flow signal is detected. The thyroid was not abnormal. Pathology results showed the wall of cyst and there were pectin in the cyst. Diagnosis: thyroglossal cyst of double cyst.