spina bifida occulta
noun
                                                                                                                            
                                                            spina bifida oc·cul·ta
                    
                                                                                                              
                                                                                                                                  -ə-ˈkəl-tə  
                                                      
                                                          
            
                                
              
          
                                                      : a mild often asymptomatic form of spina bifida in which there is no hernial protrusion of the meninges or spinal cord                                      
                
                    
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  Merriam-Webster unabridged




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