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The probe positions and ultrasound images during caudal block in an 8-months-old child. (A) The level close to the apex of the sacral hiatus was selected on the transverse view and the needle was placed at the puncture site. (B) Then, the probe was changed to the longitudinal plane and the needle was inserted into the caudal space under ultrasound guidance. (C) The injected solution can be seen within the caudal space (white arrow).
