Fig. 2From: Perioperative ultrasound imaging versus magnetic resonance imaging in management of lumbosacral spinal dysraphismsSkin dimple at the lower back. a Preoperative MRI sagittal and axial images: sinus tract to sacral spinal canal. b Preoperative LUS sagittal and axial image: black arrow sites the filum. c Postoperative MRI and LUS (sagittal and axial images): normal central echo complex (small white arrows)Back to article page