Table 2.

Detection of Epiphyseal Ossification Centers With Ultrasonography and Radiography Depending on PCH Etiology

Thyroid	Ultrasonography			Radiography
	F + T, n	F, n	Absent, n	F + T, n	F, n	Absent, n
In situ (n = 83)	70	11	2	70	11	2
Ectopic (n = 30)	13	9	8	12	8	10
Absent (n = 12)	2	4	6	2	3	7

F + T, presence of both femoral and tibial epiphyseal centers; F, presence of the femoral epiphyseal center alone.