Table 1. Characteristics of Study Patients with Spinal Variants.

No. of Presacral Mobile Vertebra	No. of Patients	Distribution of Vertebra	No. of Patients
22	1	T (10)-TLTV (1)-L (4)	1
23	9	T (11)-L (5)	1
		T (11)-TLTV (1)-L (4)	6
		T (12)-L (4)	2
24	71	T (11)-L (6)	1
		T (11)-L (5)-LSTV (1)	1
		T (11)-TLTV (1)-L (4)-LSTV (1)	5
		T (11)-TLTV (1)-L (5)	13
		T (12)-TLTV (1)-L (3)-LSTV (1)	1
		T (12)-TLTV (1)-L (4)	49
		T (12)-L (4)-LSTV (1)	1
25	19	T (12)-L (6)	2
		T (12)-L (5)-LSTV (1)	2
		T (12)-TLTV (1)-L (4)-LSTV (1)	3
		T (12)-TLTV (1)-L (5)	7
		T (13)-L (5)	5

Data in parentheses are numbers of vertebra. L = lumbar vertebra, LSTV = lumbosacral transitional vertebra, No. = number, T = thoracic vertebra, TLTV = thoracolumbar transitional vertebra