Newborn with a sacral dimple Pediatric Imaging Neurological December 1, 2022October 13, 2022 Sagittal US of the spine (above) shows the conus medullaris to terminate normally at the L1-L2 level. A hypoechoic cystic structure is seen just inferior to the conus and is better seen on the zoomed image (below). The diagnosis was filar cyst. Related Published December 1, 2022October 13, 2022