| Inbound Relationships | Type | Active | Source | Characteristic | Refinability | Group | 
| Grafting of dura mater | Is a | True | Meninges operation | Inferred relationship | Some |  | 
| Procedure on spinal meninges | Is a | False | Meninges operation | Inferred relationship | Some |  | 
| Procedure on cerebral meninges | Is a | False | Meninges operation | Inferred relationship | Some |  | 
| Intracranial subdural shunt operation | Is a | False | Meninges operation | Inferred relationship | Some |  | 
| Creation of subdural-peritoneal shunt | Is a | True | Meninges operation | Inferred relationship | Some |  | 
| Puncture of cisterna magna | Is a | False | Meninges operation | Inferred relationship | Some |  | 
| Creation of shunt from intracranial subdural space | Is a | False | Meninges operation | Inferred relationship | Some |  | 
| Revision of subdural-peritoneal shunt | Is a | False | Meninges operation | Inferred relationship | Some |  | 
| Revision of subdural-pleural shunt | Is a | False | Meninges operation | Inferred relationship | Some |  | 
| Renewal of subdural-peritoneal shunt | Is a | False | Meninges operation | Inferred relationship | Some |  | 
| Renewal of subdural-pleural shunt | Is a | False | Meninges operation | Inferred relationship | Some |  | 
| Removal of subdural-peritoneal shunt | Is a | False | Meninges operation | Inferred relationship | Some |  | 
| Removal of subdural-pleural shunt | Is a | False | Meninges operation | Inferred relationship | Some |  | 
| Spinal meninges operation | Is a | True | Meninges operation | Inferred relationship | Some |  | 
| Creation of connection from spinal subarachnoid space | Is a | False | Meninges operation | Inferred relationship | Some |  | 
| Creation of connection from spinal syrinx | Is a | False | Meninges operation | Inferred relationship | Some |  | 
| Revision of spinal subarachnoid shunt | Is a | False | Meninges operation | Inferred relationship | Some |  | 
| Renewal of spinal subarachnoid shunt | Is a | False | Meninges operation | Inferred relationship | Some |  | 
| Removal of spinal subarachnoid shunt | Is a | False | Meninges operation | Inferred relationship | Some |  | 
| Subdural neurolysis | Is a | False | Meninges operation | Inferred relationship | Some |  | 
| Ventriculocisternostomy | Is a | False | Meninges operation | Inferred relationship | Some |  | 
| Repair of spinal dysraphism | Is a | False | Meninges operation | Inferred relationship | Some |  | 
| External drainage procedure from spinal subarachnoid space | Is a | False | Meninges operation | Inferred relationship | Some |  | 
| Lysis of adhesions of cortical meninges | Is a | False | Meninges operation | Inferred relationship | Some |  | 
| Stripping of cerebral meninges | Is a | False | Meninges operation | Inferred relationship | Some |  | 
| Operation on cerebral meninges | Is a | True | Meninges operation | Inferred relationship | Some |  | 
| Ventricular shunt to cervical subarachnoid space | Is a | False | Meninges operation | Inferred relationship | Some |  | 
| Operation on spinal meninges | Is a | False | Meninges operation | Inferred relationship | Some |  | 
| Destruction of lesion of cerebral meninges | Is a | False | Meninges operation | Inferred relationship | Some |  | 
| Transplant of dura | Is a | False | Meninges operation | Inferred relationship | Some |  | 
| Marsupialisation of spinal cyst | Is a | False | Meninges operation | Inferred relationship | Some |  | 
| Ventriculocisternal intubation | Is a | False | Meninges operation | Inferred relationship | Some |  | 
| Intrathecal injection | Is a | False | Meninges operation | Inferred relationship | Some |  | 
| Incision of cerebral meninges | Is a | False | Meninges operation | Inferred relationship | Some |  | 
| Percutaneous implantation of neurostimulator electrodes, intradural | Is a | False | Meninges operation | Inferred relationship | Some |  | 
| Suture of spinal dura mater | Is a | False | Meninges operation | Inferred relationship | Some |  | 
| Lysis of adhesions of spinal meninges | Is a | False | Meninges operation | Inferred relationship | Some |  | 
| Nerve block around spinal cord meninges | Is a | False | Meninges operation | Inferred relationship | Some |  | 
| Subdural-pleural shunt operation | Is a | True | Meninges operation | Inferred relationship | Some |  | 
| Semicircular-subarachnoid shunt | Is a | False | Meninges operation | Inferred relationship | Some |  | 
| Endolymphatic-subarachnoid shunt | Is a | False | Meninges operation | Inferred relationship | Some |  | 
| Pneumoencephalography | Is a | False | Meninges operation | Inferred relationship | Some |  | 
| Drainage of cerebral subdural space by aspiration | Is a | False | Meninges operation | Inferred relationship | Some |  | 
| Epidural insertion neurostimulator electrode | Is a | False | Meninges operation | Inferred relationship | Some |  | 
| Epidural insertion of trial electrode | Is a | False | Meninges operation | Inferred relationship | Some |  | 
| Administration of epidural test dose | Is a | False | Meninges operation | Inferred relationship | Some |  | 
| Administration of epidural top-up | Is a | False | Meninges operation | Inferred relationship | Some |  | 
| Epidural neurolysis | Is a | False | Meninges operation | Inferred relationship | Some |  | 
| Epidural steroid injection | Is a | False | Meninges operation | Inferred relationship | Some |  | 
| Injection into cervical epidural space | Is a | False | Meninges operation | Inferred relationship | Some |  | 
| Injection into thoracic epidural space | Is a | False | Meninges operation | Inferred relationship | Some |  | 
| Injection into lumbar epidural space | Is a | False | Meninges operation | Inferred relationship | Some |  | 
| Injection into sacral epidural space | Is a | False | Meninges operation | Inferred relationship | Some |  | 
| Excisional biopsy of cerebral meninges, percutaneous, needle | Is a | False | Meninges operation | Inferred relationship | Some |  | 
| Needle biopsy of cerebral meninges | Is a | False | Meninges operation | Inferred relationship | Some |  | 
| Lysis of adhesions of cortical meninges | Is a | False | Meninges operation | Inferred relationship | Some |  | 
| Removal of salpingothecal shunt | Is a | False | Meninges operation | Inferred relationship | Some |  | 
| Creation of lumbar shunt including laminectomy | Is a | False | Meninges operation | Inferred relationship | Some |  | 
| Percutaneous implantation of neurostimulator electrodes, epidural | Is a | False | Meninges operation | Inferred relationship | Some |  | 
| Exploration of epidural space | Is a | False | Meninges operation | Inferred relationship | Some |  | 
| Subdural-peritoneal shunt with valve | Is a | False | Meninges operation | Inferred relationship | Some |  | 
| Drainage of intracranial space, subarachnoid or subdural by incision or trephination | Is a | False | Meninges operation | Inferred relationship | Some |  | 
| Epidural injection of contrast substance, lumbar | Is a | False | Meninges operation | Inferred relationship | Some |  | 
| Injection of anaesthetic substance, therapeutic, subdural, differential | Is a | False | Meninges operation | Inferred relationship | Some |  | 
| Injection of anaesthetic substance, therapeutic, subdural, continuous | Is a | False | Meninges operation | Inferred relationship | Some |  | 
| Removal of lesion from intracranial extradural space | Is a | True | Meninges operation | Inferred relationship | Some |  | 
| Transplant of dura | Is a | False | Meninges operation | Inferred relationship | Some |  | 
| Epidural injection of anaesthetic substance, therapeutic, lumbar, continuous | Is a | False | Meninges operation | Inferred relationship | Some |  | 
| Fistulisation of cerebral subarachnoid space | Is a | False | Meninges operation | Inferred relationship | Some |  | 
| Epidural anaesthetic NEC | Is a | False | Meninges operation | Inferred relationship | Some |  | 
| Operation on subarachnoid space of brain | Is a | False | Meninges operation | Inferred relationship | Some |  | 
| General durotomy | Is a | True | Meninges operation | Inferred relationship | Some |  | 
| Needling of hydrocephalic head | Is a | False | Meninges operation | Inferred relationship | Some |  | 
| Puncture of cisterna magna | Is a | False | Meninges operation | Inferred relationship | Some |  | 
| Removal of spinal subarachnoid shunt | Is a | False | Meninges operation | Inferred relationship | Some |  | 
| External drainage procedure from spinal subarachnoid space | Is a | False | Meninges operation | Inferred relationship | Some |  | 
| Revision of lumbosubarachnoid shunt | Is a | False | Meninges operation | Inferred relationship | Some |  | 
| Exploration of epidural space | Is a | False | Meninges operation | Inferred relationship | Some |  | 
| Revision of spinal thecal shunt | Is a | False | Meninges operation | Inferred relationship | Some |  | 
| Revision of spinal subarachnoid-ureteral shunt | Is a | False | Meninges operation | Inferred relationship | Some |  | 
| Ventriculocisternostomy | Is a | True | Meninges operation | Inferred relationship | Some |  | 
| Revision of spinal subarachnoid-peritoneal shunt | Is a | False | Meninges operation | Inferred relationship | Some |  | 
| Creation of CSF shunt | Is a | False | Meninges operation | Inferred relationship | Some |  | 
| Needling of hydrocephalic head | Is a | False | Meninges operation | Inferred relationship | Some |  | 
| Semicircular-subarachnoid shunt | Is a | True | Meninges operation | Inferred relationship | Some |  | 
| Endolymphatic-subarachnoid shunt | Is a | False | Meninges operation | Inferred relationship | Some |  | 
| Removal of subdural-pleural shunt | Is a | True | Meninges operation | Inferred relationship | Some |  | 
| Removal of subarachnoid-ureteral shunt | Is a | False | Meninges operation | Inferred relationship | Some |  | 
| Meninges - graft of dura | Is a | False | Meninges operation | Inferred relationship | Some |  | 
| Non-surgical biopsy of meninges | Is a | False | Meninges operation | Inferred relationship | Some |  | 
| Cytotoxic subarachnoid injection | Is a | False | Meninges operation | Inferred relationship | Some |  | 
| Meningocele repair | Is a | True | Meninges operation | Inferred relationship | Some |  | 
| Lumbar laminectomy and excision of intradural spinal lesion | Is a | False | Meninges operation | Inferred relationship | Some |  | 
| Thoracic laminectomy and excision of intradural spinal lesion | Is a | False | Meninges operation | Inferred relationship | Some |  | 
| Cervical laminectomy and excision of intradural spinal lesion | Is a | False | Meninges operation | Inferred relationship | Some |  | 
| Sacral laminectomy and excision of intradural spinal lesion | Is a | False | Meninges operation | Inferred relationship | Some |  | 
| Removal of external subdural drain | Is a | True | Meninges operation | Inferred relationship | Some |  | 
| Adjustment to epidural electrode | Is a | False | Meninges operation | Inferred relationship | Some |  | 
| Fistulisation of cerebral subarachnoid space | Is a | False | Meninges operation | Inferred relationship | Some |  | 
| Excision of lesion of intradural extramedullary spinal cord | Is a | False | Meninges operation | Inferred relationship | Some |  | 
| Removal of lesion from spinal intradural extramedullary space | Is a | True | Meninges operation | Inferred relationship | Some |  |