264204003: Entire subarachnoid space of brain (body structure)

SNOMED CT Concept\Body structure\Anatomical or acquired body structure\Anatomical structure\...

\Structure of anatomical cluster\Structure of anatomical compartment\Intracranial structure\...

\Brain structure\Structure of brain cerebrospinal fluid pathway\Entire subarachnoid space of brain

\Structure of brain meninges\Structure of subdural space and/or subarachnoid space of brain\Structure of subarachnoid space of brain\Entire subarachnoid space of brain

\Body organ structure\Membrane organ structure\Meninges structure\Meninges part\Leptomeninges structure\Subarachnoid space structure\Structure of subarachnoid space of brain\Entire subarachnoid space of brain
\Body organ structure\Membrane organ structure\Meninges structure\Meninges part\Structure of brain meninges\Structure of subdural space and/or subarachnoid space of brain\Structure of subarachnoid space of brain\Entire subarachnoid space of brain
\Body organ structure\Brain and spinal cord structure\Brain structure\Structure of brain cerebrospinal fluid pathway\Entire subarachnoid space of brain

\Body system structure\Structure of subdivision of organ system\Structure of subdivision of nervous system\Structure of central nervous system\Structure of central nervous system space\Structure of subdural space and/or subarachnoid space of brain\Structure of subarachnoid space of brain\Entire subarachnoid space of brain
\Body system structure\Structure of subdivision of organ system\Structure of subdivision of nervous system\Structure of central nervous system\Structure of central nervous system space\Structure of brain cerebrospinal fluid pathway\Entire subarachnoid space of brain
\Body system structure\Structure of subdivision of organ system\Structure of subdivision of nervous system\Structure of central nervous system\Structure of central nervous system space\Subarachnoid space structure\Structure of subarachnoid space of brain\Entire subarachnoid space of brain
\Body system structure\Structure of subdivision of organ system\Structure of subdivision of nervous system\Structure of central nervous system\Central nervous system part\Brain and spinal cord structure\Brain structure\Structure of brain cerebrospinal fluid pathway\Entire subarachnoid space of brain
\Body system structure\Structure of subdivision of organ system\Structure of subdivision of nervous system\Structure of central nervous system\Central nervous system part\Meninges structure\Meninges part\Leptomeninges structure\Subarachnoid space structure\Structure of subarachnoid space of brain\Entire subarachnoid space of brain
\Body system structure\Structure of subdivision of organ system\Structure of subdivision of nervous system\Structure of central nervous system\Central nervous system part\Meninges structure\Meninges part\Structure of brain meninges\Structure of subdural space and/or subarachnoid space of brain\Structure of subarachnoid space of brain\Entire subarachnoid space of brain
\Body system structure\Structure of nervous system\Structure of subdivision of nervous system\Structure of central nervous system\Structure of central nervous system space\Structure of subdural space and/or subarachnoid space of brain\Structure of subarachnoid space of brain\Entire subarachnoid space of brain
\Body system structure\Structure of nervous system\Structure of subdivision of nervous system\Structure of central nervous system\Structure of central nervous system space\Structure of brain cerebrospinal fluid pathway\Entire subarachnoid space of brain
\Body system structure\Structure of nervous system\Structure of subdivision of nervous system\Structure of central nervous system\Structure of central nervous system space\Subarachnoid space structure\Structure of subarachnoid space of brain\Entire subarachnoid space of brain
\Body system structure\Structure of nervous system\Structure of subdivision of nervous system\Structure of central nervous system\Central nervous system part\Brain and spinal cord structure\Brain structure\Structure of brain cerebrospinal fluid pathway\Entire subarachnoid space of brain
\Body system structure\Structure of nervous system\Structure of subdivision of nervous system\Structure of central nervous system\Central nervous system part\Meninges structure\Meninges part\Leptomeninges structure\Subarachnoid space structure\Structure of subarachnoid space of brain\Entire subarachnoid space of brain
\Body system structure\Structure of nervous system\Structure of subdivision of nervous system\Structure of central nervous system\Central nervous system part\Meninges structure\Meninges part\Structure of brain meninges\Structure of subdural space and/or subarachnoid space of brain\Structure of subarachnoid space of brain\Entire subarachnoid space of brain

\Body region structure\Body part structure\Upper body structure\Upper body part structure\Structure of head and/or neck\Head structure\Head part\Intracranial structure\...

\Brain structure\Structure of brain cerebrospinal fluid pathway\Entire subarachnoid space of brain

\Structure of brain meninges\Structure of subdural space and/or subarachnoid space of brain\Structure of subarachnoid space of brain\Entire subarachnoid space of brain

\Anatomical space structure\Structure of central nervous system space\...

\Structure of subdural space and/or subarachnoid space of brain\Structure of subarachnoid space of brain\Entire subarachnoid space of brain

\Structure of brain cerebrospinal fluid pathway\Entire subarachnoid space of brain

\Subarachnoid space structure\Structure of subarachnoid space of brain\Entire subarachnoid space of brain

Status: current, Not sufficiently defined by necessary conditions definition status. Date: 31-Jan 2002. Module: SNOMED CT core module

Descriptions:

Id Description Lang Type Status Case? Module

2638429011 Entire subarachnoid space of brain (body structure) en Fully specified name Active Entire term case insensitive SNOMED CT core module

2642465011 Entire subarachnoid space of brain en Synonym Active Entire term case insensitive SNOMED CT core module

3328620015 Entire cranial subarachnoid space en Synonym Active Entire term case insensitive SNOMED CT core module

Expanded Value Set

Outbound Relationships	Type	Target	Active	Characteristic	Refinability	Group	Values
Entire subarachnoid space of brain	Is a	Structure of brain meningeal space	false	Inferred relationship	Existential restriction modifier
Entire subarachnoid space of brain	Is a	Structure of brain cerebrospinal fluid pathway	true	Inferred relationship	Existential restriction modifier
Entire subarachnoid space of brain	Is a	Subarachnoid space structure	false	Inferred relationship	Existential restriction modifier
Entire subarachnoid space of brain	Part of	Entire cranial cavity	false	Additional relationship	Existential restriction modifier
Entire subarachnoid space of brain	Part of	Entire meninges	false	Additional relationship	Existential restriction modifier
Entire subarachnoid space of brain	Is a	Structure of subarachnoid space of brain	true	Inferred relationship	Existential restriction modifier

Inbound Relationships	Type	Active	Source	Characteristic	Refinability	Group
Structure of cerebellar subarachnoid space	Is a	False	Entire subarachnoid space of brain	Inferred relationship	Existential restriction modifier
Structure of frontal subarachnoid space	Is a	False	Entire subarachnoid space of brain	Inferred relationship	Existential restriction modifier
Structure of occipital subarachnoid space	Is a	False	Entire subarachnoid space of brain	Inferred relationship	Existential restriction modifier
Structure of parietal subarachnoid space	Is a	False	Entire subarachnoid space of brain	Inferred relationship	Existential restriction modifier
Structure of sagittal subarachnoid space	Is a	False	Entire subarachnoid space of brain	Inferred relationship	Existential restriction modifier
Structure of temporal subarachnoid space	Is a	False	Entire subarachnoid space of brain	Inferred relationship	Existential restriction modifier
Structure of subarachnoid cistern	Is a	False	Entire subarachnoid space of brain	Inferred relationship	Existential restriction modifier
Operation on subarachnoid space of brain	Procedure site	False	Entire subarachnoid space of brain	Inferred relationship	Existential restriction modifier	1
Drainage of subarachnoid space of brain	Procedure site	False	Entire subarachnoid space of brain	Inferred relationship	Existential restriction modifier	1
Arachnoid cyst of pituitary	Finding site	False	Entire subarachnoid space of brain	Inferred relationship	Existential restriction modifier	1
Cerebral arachnoid cyst	Finding site	False	Entire subarachnoid space of brain	Inferred relationship	Existential restriction modifier	1
Subarachnoid hemorrhage due to traumatic injury	Finding site	False	Entire subarachnoid space of brain	Inferred relationship	Existential restriction modifier	1
Spontaneous intracranial subarachnoid hemorrhage	Finding site	False	Entire subarachnoid space of brain	Inferred relationship	Existential restriction modifier	1
Angiogram-negative intracranial subarachnoid hemorrhage	Finding site	False	Entire subarachnoid space of brain	Inferred relationship	Existential restriction modifier	1
Perinatal intracranial subarachnoid hemorrhage	Finding site	False	Entire subarachnoid space of brain	Inferred relationship	Existential restriction modifier	1
Incision of cerebral subarachnoid space	Procedure site	False	Entire subarachnoid space of brain	Inferred relationship	Existential restriction modifier	1
Drainage of cerebral subarachnoid space by aspiration	Procedure site	False	Entire subarachnoid space of brain	Inferred relationship	Existential restriction modifier	1
Subarachnoid hemorrhage following injury with open intracranial wound AND moderate loss of consciousness (1-24 hours)	Finding site	False	Entire subarachnoid space of brain	Inferred relationship	Existential restriction modifier	1
Rupture of syphilitic cerebral aneurysm	Finding site	False	Entire subarachnoid space of brain	Inferred relationship	Existential restriction modifier
Subarachnoid hemorrhage from carotid siphon and bifurcation	Finding site	False	Entire subarachnoid space of brain	Inferred relationship	Existential restriction modifier	1
Intracranial subarachnoid hemorrhage from vertebral artery	Finding site	False	Entire subarachnoid space of brain	Inferred relationship	Existential restriction modifier	1
Intracranial subarachnoid hemorrhage due to birth injury	Finding site	False	Entire subarachnoid space of brain	Inferred relationship	Existential restriction modifier	1
Subarachnoid hemorrhage following injury without mention of open intracranial wound, with no loss of consciousness	Finding site	False	Entire subarachnoid space of brain	Inferred relationship	Existential restriction modifier	2
Subarachnoid hemorrhage following injury without mention of open intracranial wound, with less than 1 hour loss of consciousness	Finding site	False	Entire subarachnoid space of brain	Inferred relationship	Existential restriction modifier	2
Subarachnoid hemorrhage following injury without mention of open intracranial wound, with 1-24 hours loss of consciousness	Finding site	False	Entire subarachnoid space of brain	Inferred relationship	Existential restriction modifier	1
Subarachnoid hemorrhage following injury without mention of open intracranial wound, with more than 24 hours loss of consciousness and return to pre-existing conscious level	Finding site	False	Entire subarachnoid space of brain	Inferred relationship	Existential restriction modifier	2
Subarachnoid hemorrhage following injury without mention of open intracranial wound, with more than 24 hours loss of consciousness without return to pre-existing conscious level	Finding site	False	Entire subarachnoid space of brain	Inferred relationship	Existential restriction modifier	2
Subarachnoid hemorrhage following injury with open intracranial wound, with no loss of consciousness	Finding site	False	Entire subarachnoid space of brain	Inferred relationship	Existential restriction modifier	2
Subarachnoid hemorrhage following injury with open intracranial wound, with less than 1 hour loss of consciousness	Finding site	False	Entire subarachnoid space of brain	Inferred relationship	Existential restriction modifier	4
Subarachnoid hemorrhage following injury with open intracranial wound, with 1-24 hours loss of consciousness	Finding site	False	Entire subarachnoid space of brain	Inferred relationship	Existential restriction modifier	1
Subarachnoid hemorrhage following injury with open intracranial wound, with more than 24 hours loss of consciousness and return to pre-existing conscious level	Finding site	False	Entire subarachnoid space of brain	Inferred relationship	Existential restriction modifier	1
Subarachnoid hemorrhage following injury with open intracranial wound, with more than 24 hours loss of consciousness without return to pre-existing conscious level	Finding site	False	Entire subarachnoid space of brain	Inferred relationship	Existential restriction modifier	1
Subarachnoid hemorrhage due to ruptured arteriovenous malformation	Finding site	False	Entire subarachnoid space of brain	Inferred relationship	Existential restriction modifier	1
Intracranial subarachnoid hemorrhage due to ruptured aneurysm	Finding site	False	Entire subarachnoid space of brain	Inferred relationship	Existential restriction modifier	1
Subarachnoid hemorrhage from multiple aneurysms	Finding site	False	Entire subarachnoid space of brain	Inferred relationship	Existential restriction modifier	1
Subarachnoid hemorrhage from anterior cerebral artery aneurysm	Finding site	False	Entire subarachnoid space of brain	Inferred relationship	Existential restriction modifier	1
Subarachnoid hemorrhage from middle cerebral artery aneurysm	Finding site	False	Entire subarachnoid space of brain	Inferred relationship	Existential restriction modifier	1
Subarachnoid hemorrhage from posterior cerebral artery aneurysm	Finding site	False	Entire subarachnoid space of brain	Inferred relationship	Existential restriction modifier	1
Subarachnoid hemorrhage from anterior communicating artery aneurysm	Finding site	False	Entire subarachnoid space of brain	Inferred relationship	Existential restriction modifier	1
Subarachnoid hemorrhage from posterior communicating artery aneurysm	Finding site	False	Entire subarachnoid space of brain	Inferred relationship	Existential restriction modifier	1
Subarachnoid hemorrhage from basilar artery aneurysm	Finding site	False	Entire subarachnoid space of brain	Inferred relationship	Existential restriction modifier	1
Subarachnoid hemorrhage from posterior inferior cerebellar artery aneurysm	Finding site	False	Entire subarachnoid space of brain	Inferred relationship	Existential restriction modifier	1
Subarachnoid hemorrhage from carotid artery aneurysm	Finding site	False	Entire subarachnoid space of brain	Inferred relationship	Existential restriction modifier	1
Other specified operation on subarachnoid space of brain	Procedure site	False	Entire subarachnoid space of brain	Inferred relationship	Existential restriction modifier	1
Operation on subarachnoid space of brain NOS	Procedure site	False	Entire subarachnoid space of brain	Inferred relationship	Existential restriction modifier	1
Subarachnoid hemorrhage NOS	Finding site	False	Entire subarachnoid space of brain	Inferred relationship	Existential restriction modifier
Subarachnoid hemorrhage following injury with open intracranial wound, unspecified state of consciousness	Finding site	False	Entire subarachnoid space of brain	Inferred relationship	Existential restriction modifier	2
Subarachnoid hemorrhage following injury with open intracranial wound, with loss of consciousness of unspecified duration	Finding site	False	Entire subarachnoid space of brain	Inferred relationship	Existential restriction modifier	1
Subarachnoid hemorrhage following injury with open intracranial wound, with concussion, unspecified	Finding site	False	Entire subarachnoid space of brain	Inferred relationship	Existential restriction modifier	1
Subarachnoid hemorrhage following injury with open intracranial wound, with no loss of consciousness	Finding site	False	Entire subarachnoid space of brain	Inferred relationship	Existential restriction modifier	2
Subarachnoid hemorrhage following injury with open intracranial wound, with less than 1 hour loss of consciousness	Finding site	False	Entire subarachnoid space of brain	Inferred relationship	Existential restriction modifier	2
Subarachnoid hemorrhage following injury with open intracranial wound, with 1-24 hours loss of consciousness	Finding site	False	Entire subarachnoid space of brain	Inferred relationship	Existential restriction modifier	2
Subarachnoid hemorrhage following injury with open intracranial wound, with more than 24 hours loss of consciousness and return to pre-existing conscious level	Finding site	False	Entire subarachnoid space of brain	Inferred relationship	Existential restriction modifier	2
Subarachnoid hemorrhage following injury with open intracranial wound, with more than 24 hours loss of consciousness without return to pre-existing conscious level	Finding site	False	Entire subarachnoid space of brain	Inferred relationship	Existential restriction modifier	1
Subarachnoid hemorrhage following injury with open intracranial wound, with 1-24 hours loss of consciousness	Finding site	False	Entire subarachnoid space of brain	Inferred relationship	Existential restriction modifier	1
Subarachnoid hemorrhage following injury with open intracranial wound, with less than 1 hour loss of consciousness	Finding site	False	Entire subarachnoid space of brain	Inferred relationship	Existential restriction modifier	4
Subarachnoid hemorrhage following injury with open intracranial wound, with no loss of consciousness	Finding site	False	Entire subarachnoid space of brain	Inferred relationship	Existential restriction modifier	4
Subarachnoid hemorrhage following injury with open intracranial wound, with more than 24 hours loss of consciousness and return to pre-existing conscious level	Finding site	False	Entire subarachnoid space of brain	Inferred relationship	Existential restriction modifier	3
Subarachnoid hemorrhage following injury with open intracranial wound, with more than 24 hours loss of consciousness without return to pre-existing conscious level	Finding site	False	Entire subarachnoid space of brain	Inferred relationship	Existential restriction modifier	3
Subarachnoid hemorrhage following injury with open intracranial wound, with 1-24 hours loss of consciousness	Finding site	False	Entire subarachnoid space of brain	Inferred relationship	Existential restriction modifier	2
Subarachnoid hemorrhage following injury with open intracranial wound, with less than 1 hour loss of consciousness	Finding site	False	Entire subarachnoid space of brain	Inferred relationship	Existential restriction modifier	4
Subarachnoid hemorrhage following injury with open intracranial wound, with no loss of consciousness	Finding site	False	Entire subarachnoid space of brain	Inferred relationship	Existential restriction modifier	4
Subarachnoid hemorrhage following injury with open intracranial wound, with more than 24 hours loss of consciousness and return to pre-existing conscious level	Finding site	False	Entire subarachnoid space of brain	Inferred relationship	Existential restriction modifier	1
Subarachnoid hemorrhage following injury with open intracranial wound, with more than 24 hours loss of consciousness without return to pre-existing conscious level	Finding site	False	Entire subarachnoid space of brain	Inferred relationship	Existential restriction modifier	2
Subarachnoid hemorrhage following injury with open intracranial wound, with 1-24 hours loss of consciousness	Finding site	False	Entire subarachnoid space of brain	Inferred relationship	Existential restriction modifier	1
Subarachnoid hemorrhage following injury with open intracranial wound, with less than 1 hour loss of consciousness	Finding site	False	Entire subarachnoid space of brain	Inferred relationship	Existential restriction modifier	2
Subarachnoid hemorrhage following injury with open intracranial wound, with more than 24 hours loss of consciousness and return to pre-existing conscious level	Finding site	False	Entire subarachnoid space of brain	Inferred relationship	Existential restriction modifier	3
Subarachnoid hemorrhage following injury with open intracranial wound, with more than 24 hours loss of consciousness without return to pre-existing conscious level	Finding site	False	Entire subarachnoid space of brain	Inferred relationship	Existential restriction modifier	3
Drainage of intracranial space, subarachnoid or subdural by incision or trephination	Procedure site	False	Entire subarachnoid space of brain	Inferred relationship	Existential restriction modifier	2
Drainage of intracranial space, subarachnoid or subdural by incision or trephination	Procedure site	False	Entire subarachnoid space of brain	Inferred relationship	Existential restriction modifier	3
Drainage of intracranial space, subarachnoid or subdural by incision or trephination	Procedure site	False	Entire subarachnoid space of brain	Inferred relationship	Existential restriction modifier	1
Drainage of cerebral subdural space by incision or trephination	Procedure site	False	Entire subarachnoid space of brain	Inferred relationship	Existential restriction modifier	3
Drainage of cerebral subdural space by incision or trephination	Procedure site	False	Entire subarachnoid space of brain	Inferred relationship	Existential restriction modifier	4
Drainage of cerebral subdural space by incision or trephination	Procedure site	False	Entire subarachnoid space of brain	Inferred relationship	Existential restriction modifier	2
Subarachnoid hemorrhage following injury with open intracranial wound, with 1-24 hours loss of consciousness	Finding site	False	Entire subarachnoid space of brain	Inferred relationship	Existential restriction modifier	2
Subarachnoid hemorrhage following injury with open intracranial wound, with 1-24 hours loss of consciousness	Finding site	False	Entire subarachnoid space of brain	Inferred relationship	Existential restriction modifier	1
Subarachnoid hemorrhage following injury with open intracranial wound, with less than 1 hour loss of consciousness	Finding site	False	Entire subarachnoid space of brain	Inferred relationship	Existential restriction modifier	2
Subarachnoid hemorrhage following injury with open intracranial wound, with less than 1 hour loss of consciousness	Finding site	False	Entire subarachnoid space of brain	Inferred relationship	Existential restriction modifier	1
Subarachnoid hemorrhage following injury with open intracranial wound, with more than 24 hours loss of consciousness and return to pre-existing conscious level	Finding site	False	Entire subarachnoid space of brain	Inferred relationship	Existential restriction modifier	2
Subarachnoid hemorrhage following injury with open intracranial wound, with more than 24 hours loss of consciousness and return to pre-existing conscious level	Finding site	False	Entire subarachnoid space of brain	Inferred relationship	Existential restriction modifier	1
Subarachnoid hemorrhage following injury with open intracranial wound, with more than 24 hours loss of consciousness without return to pre-existing conscious level	Finding site	False	Entire subarachnoid space of brain	Inferred relationship	Existential restriction modifier	2
Subarachnoid hemorrhage following injury with open intracranial wound, with more than 24 hours loss of consciousness without return to pre-existing conscious level	Finding site	False	Entire subarachnoid space of brain	Inferred relationship	Existential restriction modifier	1
Drainage of intracranial space, subarachnoid or subdural by incision or trephination	Procedure site	False	Entire subarachnoid space of brain	Inferred relationship	Existential restriction modifier	3
Drainage of intracranial space, subarachnoid or subdural by incision or trephination	Procedure site	False	Entire subarachnoid space of brain	Inferred relationship	Existential restriction modifier	2
Drainage of intracranial space, subarachnoid or subdural by incision or trephination	Procedure site	False	Entire subarachnoid space of brain	Inferred relationship	Existential restriction modifier	1
Drainage of cerebral subdural space by incision or trephination	Procedure site	False	Entire subarachnoid space of brain	Inferred relationship	Existential restriction modifier	3
Drainage of cerebral subdural space by incision or trephination	Procedure site	False	Entire subarachnoid space of brain	Inferred relationship	Existential restriction modifier	2
Drainage of cerebral subdural space by incision or trephination	Procedure site	False	Entire subarachnoid space of brain	Inferred relationship	Existential restriction modifier	1
Drainage of subarachnoid space of brain	Procedure site	False	Entire subarachnoid space of brain	Inferred relationship	Existential restriction modifier	2
Drainage of subarachnoid space of brain	Procedure site	False	Entire subarachnoid space of brain	Inferred relationship	Existential restriction modifier	1
Subarachnoid hemorrhage following injury with open intracranial wound, with 1-24 hours loss of consciousness	Finding site	False	Entire subarachnoid space of brain	Inferred relationship	Existential restriction modifier	1
Subarachnoid hemorrhage following injury with open intracranial wound, with 1-24 hours loss of consciousness	Finding site	False	Entire subarachnoid space of brain	Inferred relationship	Existential restriction modifier	2
Subarachnoid hemorrhage following injury with open intracranial wound, with less than 1 hour loss of consciousness	Finding site	False	Entire subarachnoid space of brain	Inferred relationship	Existential restriction modifier	3
Subarachnoid hemorrhage following injury with open intracranial wound, with less than 1 hour loss of consciousness	Finding site	False	Entire subarachnoid space of brain	Inferred relationship	Existential restriction modifier	2
Subarachnoid hemorrhage following injury with open intracranial wound, with more than 24 hours loss of consciousness and return to pre-existing conscious level	Finding site	False	Entire subarachnoid space of brain	Inferred relationship	Existential restriction modifier	2
Subarachnoid hemorrhage following injury with open intracranial wound, with more than 24 hours loss of consciousness and return to pre-existing conscious level	Finding site	False	Entire subarachnoid space of brain	Inferred relationship	Existential restriction modifier	1
Subarachnoid hemorrhage following injury with open intracranial wound, with more than 24 hours loss of consciousness without return to pre-existing conscious level	Finding site	False	Entire subarachnoid space of brain	Inferred relationship	Existential restriction modifier	1
Subarachnoid hemorrhage following injury with open intracranial wound, with more than 24 hours loss of consciousness without return to pre-existing conscious level	Finding site	False	Entire subarachnoid space of brain	Inferred relationship	Existential restriction modifier	2
Drainage of subarachnoid space of brain	Procedure site	False	Entire subarachnoid space of brain	Inferred relationship	Existential restriction modifier	2
Drainage of subarachnoid space of brain	Procedure site	False	Entire subarachnoid space of brain	Inferred relationship	Existential restriction modifier	1
Subarachnoid hemorrhage following injury with open intracranial wound, with 1-24 hours loss of consciousness	Finding site	False	Entire subarachnoid space of brain	Inferred relationship	Existential restriction modifier	2

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Id	Description	Lang	Type	Status	Case?	Module
2638429011	Entire subarachnoid space of brain (body structure)	en	Fully specified name	Active	Entire term case insensitive	SNOMED CT core module
2642465011	Entire subarachnoid space of brain	en	Synonym	Active	Entire term case insensitive	SNOMED CT core module
3328620015	Entire cranial subarachnoid space	en	Synonym	Active	Entire term case insensitive	SNOMED CT core module