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. 2015 Feb 27;16(2):419–429. doi: 10.3348/kjr.2015.16.2.419

Fig. 2. Thyroid aplasia in 29-day-old boy.

Fig. 2

Thyroid stimulating hormone level was > 95 µU/mL (normal range, 0.25-4.0 µU/mL). A. Transverse ultrasonography (US) reveals hyperechogenic structures (arrows) on both sides of trachea in empty thyroid area, signifying remnants of ultimobranchial body. Refer to Figure 4A for US findings of normal thyroid gland. B. Anteroposterior views of Tc-99m scan confirm absence of detectable thyroid activity, with only background soft tissue and salivary glands visible.