Figure 1.
Illustration of the step-wise technique for identification of the level of transverse process. A, The probe is placed at the lumbar back parallel to the rib. a, The lumbar muscles are seen on the ultrasonogram. B, The probe is parallel-shifted cephalad. b, The 12th rib (green arrow) comes into view. C, The probe is rotated to the sagittal plane. c, The transverse process of T11 and T12 is in the same visual field, and the superior costotransverse ligament (red arrow) is identified. D, The probe is moved cephalad. d, Transverse process of T10 and T11 is in the same visual field. E, The probe is moved caudad. e, transverse process of T12 and L1 is in the same visual field, and the intertransverse ligament (yellow arrow) is identified. R = rib, TP = transverse process.