Adult with sacral lipomyelomeningocele covered by an anomalous bone articulated with iliac bone: Computed tomography and magnetic resonance images

The present paper reports and discusses a case of sacral lipomyelomeningocele with an anomalous long bone articulating with the left iliac bone in a 40-year-old female. That patient had a monozygotic twin sister who had normal spine. The findings were incidental during an evaluation for a urinary tract infection. The computed tomography (CT) and magnetic resonance (MR) images revealed sacral dysraphism, lipomyelomeningocele, tethered spinal cord, and profound subcutaneous fat in the sacrococcygeal region. In addition, an anomalous bony strut was demonstrated on the posterior aspect of the sacrum, covering the sacral defect and the associated lipomyelomeningocele. The 3-D CT images of the anomalous bone associated with the sacral lipomyelomeningocele and the putative embryologic process are presented with a review of the literature.