spina bifida cystica posterior meningocele https://www.malacards.org/card/isolated_posterior_meningocele MEDGEN:1806905 GARD:0020965 Orphanet:268810 MONDO:0017076 Posterior meningocele is a rare neural tube closure defect characterized by the herniation of a cerebrospinal fluid-filled sac, that is lined by dura and arachnoid mater, through a posterior spina bifida and covered by a layer of skin of variable thickness, which may be dysplastic or ulcerated. The spinal cord and nerves are generally not included and function normally, although sometimes a tethered cord may be associated. They are most commonly located in the lumbar or sacral region. icd11.foundation:1464755755 UMLS:C5680741