There are three major classification of spinal lipomas, which lipomyelomeningoceles fall into. The majority of spinal lipomas occur in the lower back on the lumbar spine. The first is the dorsal type, which means that the disruption of the spinal cord occurs on the dorsal, ie towards the back, portion of the spinal cord. There may be nerves affected, but these types of spinal lipomas generally do not extend into the conus medullaris, which is the ends of spinal cord nerves. Dorsal lipomas are typically caused by errors in primary neurulation. In the caudal group of spinal lipomas, the place where the lipoma and spinal cord elements meet is located mainly inside of the spinal cord and affects the conus medullaris directly. Caudal spinal lipomas are caused by errors in secondary neurulation. The transitional group is a combination of the dorsal and caudal types. An important characteristic of these is that there are elements of nerves that can be found within the lipoma itself. Transitional spinal lipomas are caused by errors in both primary and secondary neurulation.
Lipomeningomyelocele
Sialocele
Lateral meningocele syndrome
Encephalocele
Choroid plexus cyst
Diastematomyelia
Choroid plexus tumor
Sacrococcygeal teratoma