School ager with a faun’s tail in the middle of the lower back Vintage AP tomogram obtained through the posterior elements of the lumbar spine (left) shows a linear piece of bone in the midline between the L3 and L4 vertebral bodies. Axial CT without contrast of the spine (right) through the L3/L4 disc space shows a piece of bone in the center of the spinal canal The diagnosis was diastematomyelia.