Findings suggest this being a type of lateral thoracic meningocele.

However, the presence of entrapped fat/lipoma abutting the cord, complex dural folds, as well as deformed and diminished spinal cord suggest that this is more like a developmental/congenital "lipomyeloschisis", rather than dural deformity/ectasia seen in mesenchymal diseases such as neurofibromatosis type 1 and Marfan syndrome. Yet the posterior bony elements are intact.

There is no clear-cut terminology to use - is this a meningocele, lipomeningocele, or lipomyelomeningocele?

There is no recent literature to help.