Table 2.

Literature review: patients with follow-up ultrasounds for intrathyroidal thymic tissue.

Study	Number of patients	Interval of follow-up ultrasounds	Changes in intrathyroidal thymic tissue appearance
Segni et al. [7]	9	Mean 34 months	2/9 with reduced size
		(6–84 months)	1/9 with increased size (age 13 months)
Kim et al.[3]	3	6, 11, and 18 months	3/3 with stable size and echo pattern
Yildiz et al. [5]	9	Mean 15.2 months	8/9 with stable size
		(0–48 months)	1/9 with reduced size
Vlachopapadopoulou et al. [4]	36	6, 12, and 18 months	31/36 with stable size
			4/36 with reduced size (adolescents)
			1/36 with resolution (1.5 years later)
Frates et al. [6]	8	2 months—5 years	7/8 with stable size
			1/8 with resolution (5 years later)