92050000: Benign neoplasm of cerebellum (disorder)

SNOMED CT Concept\Clinical finding (finding)\...

\Mass of body structure\Mass of body region\Mass of head and/or neck (finding)\Mass of head (finding)\Neoplasm of head\Intracranial tumour\Neoplasm of brain\Neoplasm of cerebellum\Benign neoplasm of cerebellum
\Mass of body structure\Mass of body region\Mass of head and/or neck (finding)\Mass of head (finding)\Neoplasm of head\Intracranial tumour\Neoplasm of brain\Benign neoplasm of brain\Benign neoplasm of infratentorial brain (disorder)\Benign neoplasm of cerebellum
\Mass of body structure\Mass of body region\Mass of head and/or neck (finding)\Mass of head (finding)\Neoplasm of head\Benign neoplasm of head\Benign neoplasm of brain\Benign neoplasm of infratentorial brain (disorder)\Benign neoplasm of cerebellum
\Mass of body structure\Mass of body region\Mass of head and/or neck (finding)\Mass of head (finding)\Intracranial mass\Mass lesion of brain (finding)\Neoplasm of brain\Neoplasm of cerebellum\Benign neoplasm of cerebellum
\Mass of body structure\Mass of body region\Mass of head and/or neck (finding)\Mass of head (finding)\Intracranial mass\Mass lesion of brain (finding)\Neoplasm of brain\Benign neoplasm of brain\Benign neoplasm of infratentorial brain (disorder)\Benign neoplasm of cerebellum
\Mass of body structure\Mass of body region\Mass of head and/or neck (finding)\Mass of head (finding)\Intracranial mass\Intracranial tumour\Neoplasm of brain\Neoplasm of cerebellum\Benign neoplasm of cerebellum
\Mass of body structure\Mass of body region\Mass of head and/or neck (finding)\Mass of head (finding)\Intracranial mass\Intracranial tumour\Neoplasm of brain\Benign neoplasm of brain\Benign neoplasm of infratentorial brain (disorder)\Benign neoplasm of cerebellum
\Mass of body structure\Mass of body region\Mass of head and/or neck (finding)\Neoplasm of head and neck\Benign tumour of head and neck\Benign neoplasm of head\Benign neoplasm of brain\Benign neoplasm of infratentorial brain (disorder)\Benign neoplasm of cerebellum
\Mass of body structure\Mass of body region\Mass of head and/or neck (finding)\Neoplasm of head and neck\Neoplasm of head\Intracranial tumour\Neoplasm of brain\Neoplasm of cerebellum\Benign neoplasm of cerebellum
\Mass of body structure\Mass of body region\Mass of head and/or neck (finding)\Neoplasm of head and neck\Neoplasm of head\Intracranial tumour\Neoplasm of brain\Benign neoplasm of brain\Benign neoplasm of infratentorial brain (disorder)\Benign neoplasm of cerebellum
\Mass of body structure\Mass of body region\Mass of head and/or neck (finding)\Neoplasm of head and neck\Neoplasm of head\Benign neoplasm of head\Benign neoplasm of brain\Benign neoplasm of infratentorial brain (disorder)\Benign neoplasm of cerebellum
\Mass of body structure\Space-occupying lesion of nervous system\Mass lesion of brain (finding)\Neoplasm of brain\Neoplasm of cerebellum\Benign neoplasm of cerebellum
\Mass of body structure\Space-occupying lesion of nervous system\Mass lesion of brain (finding)\Neoplasm of brain\Benign neoplasm of brain\Benign neoplasm of infratentorial brain (disorder)\Benign neoplasm of cerebellum
\Mass of body structure\Space-occupying lesion of nervous system\Neoplasm of nervous system\Neoplasm of central nervous system\Neoplasm of brain\Neoplasm of cerebellum\Benign neoplasm of cerebellum
\Mass of body structure\Space-occupying lesion of nervous system\Neoplasm of nervous system\Neoplasm of central nervous system\Neoplasm of brain\Benign neoplasm of brain\Benign neoplasm of infratentorial brain (disorder)\Benign neoplasm of cerebellum
\Mass of body structure\Space-occupying lesion of nervous system\Neoplasm of nervous system\Neoplasm of central nervous system\Benign neoplasm of central nervous system\Benign neoplasm of brain\Benign neoplasm of infratentorial brain (disorder)\Benign neoplasm of cerebellum
\Mass of body structure\Space-occupying lesion of nervous system\Neoplasm of nervous system\Benign neoplasm of nervous system\Benign neoplasm of central nervous system\Benign neoplasm of brain\Benign neoplasm of infratentorial brain (disorder)\Benign neoplasm of cerebellum

\Neurological lesion\Lesion of brain\Neoplasm of brain\Neoplasm of cerebellum\Benign neoplasm of cerebellum
\Neurological lesion\Lesion of brain\Neoplasm of brain\Benign neoplasm of brain\Benign neoplasm of infratentorial brain (disorder)\Benign neoplasm of cerebellum
\Neurological lesion\Space-occupying lesion of nervous system\Mass lesion of brain (finding)\Neoplasm of brain\Neoplasm of cerebellum\Benign neoplasm of cerebellum
\Neurological lesion\Space-occupying lesion of nervous system\Mass lesion of brain (finding)\Neoplasm of brain\Benign neoplasm of brain\Benign neoplasm of infratentorial brain (disorder)\Benign neoplasm of cerebellum
\Neurological lesion\Space-occupying lesion of nervous system\Neoplasm of nervous system\Neoplasm of central nervous system\Neoplasm of brain\Neoplasm of cerebellum\Benign neoplasm of cerebellum
\Neurological lesion\Space-occupying lesion of nervous system\Neoplasm of nervous system\Neoplasm of central nervous system\Neoplasm of brain\Benign neoplasm of brain\Benign neoplasm of infratentorial brain (disorder)\Benign neoplasm of cerebellum
\Neurological lesion\Space-occupying lesion of nervous system\Neoplasm of nervous system\Neoplasm of central nervous system\Benign neoplasm of central nervous system\Benign neoplasm of brain\Benign neoplasm of infratentorial brain (disorder)\Benign neoplasm of cerebellum
\Neurological lesion\Space-occupying lesion of nervous system\Neoplasm of nervous system\Benign neoplasm of nervous system\Benign neoplasm of central nervous system\Benign neoplasm of brain\Benign neoplasm of infratentorial brain (disorder)\Benign neoplasm of cerebellum

\Central nervous system finding\Finding of brain\Mass lesion of brain (finding)\Neoplasm of brain\Neoplasm of cerebellum\Benign neoplasm of cerebellum
\Central nervous system finding\Finding of brain\Mass lesion of brain (finding)\Neoplasm of brain\Benign neoplasm of brain\Benign neoplasm of infratentorial brain (disorder)\Benign neoplasm of cerebellum
\Central nervous system finding\Finding of brain\Disorder of brain (disorder)\Lesion of brain\Neoplasm of brain\Neoplasm of cerebellum\Benign neoplasm of cerebellum
\Central nervous system finding\Finding of brain\Disorder of brain (disorder)\Lesion of brain\Neoplasm of brain\Benign neoplasm of brain\Benign neoplasm of infratentorial brain (disorder)\Benign neoplasm of cerebellum
\Central nervous system finding\Finding of brain\Disorder of brain (disorder)\Cerebellar disorder\Neoplasm of cerebellum\Benign neoplasm of cerebellum
\Central nervous system finding\Disorder of the central nervous system (disorder)\Neoplasm of central nervous system\Neoplasm of brain\Neoplasm of cerebellum\Benign neoplasm of cerebellum
\Central nervous system finding\Disorder of the central nervous system (disorder)\Neoplasm of central nervous system\Neoplasm of brain\Benign neoplasm of brain\Benign neoplasm of infratentorial brain (disorder)\Benign neoplasm of cerebellum
\Central nervous system finding\Disorder of the central nervous system (disorder)\Neoplasm of central nervous system\Benign neoplasm of central nervous system\Benign neoplasm of brain\Benign neoplasm of infratentorial brain (disorder)\Benign neoplasm of cerebellum
\Central nervous system finding\Disorder of the central nervous system (disorder)\Disorder of brain (disorder)\Lesion of brain\Neoplasm of brain\Neoplasm of cerebellum\Benign neoplasm of cerebellum
\Central nervous system finding\Disorder of the central nervous system (disorder)\Disorder of brain (disorder)\Lesion of brain\Neoplasm of brain\Benign neoplasm of brain\Benign neoplasm of infratentorial brain (disorder)\Benign neoplasm of cerebellum
\Central nervous system finding\Disorder of the central nervous system (disorder)\Disorder of brain (disorder)\Cerebellar disorder\Neoplasm of cerebellum\Benign neoplasm of cerebellum

\Finding of head and neck region\Head finding (finding)\Mass of head (finding)\Neoplasm of head\Intracranial tumour\Neoplasm of brain\Neoplasm of cerebellum\Benign neoplasm of cerebellum
\Finding of head and neck region\Head finding (finding)\Mass of head (finding)\Neoplasm of head\Intracranial tumour\Neoplasm of brain\Benign neoplasm of brain\Benign neoplasm of infratentorial brain (disorder)\Benign neoplasm of cerebellum
\Finding of head and neck region\Head finding (finding)\Mass of head (finding)\Neoplasm of head\Benign neoplasm of head\Benign neoplasm of brain\Benign neoplasm of infratentorial brain (disorder)\Benign neoplasm of cerebellum
\Finding of head and neck region\Head finding (finding)\Mass of head (finding)\Intracranial mass\Mass lesion of brain (finding)\Neoplasm of brain\Neoplasm of cerebellum\Benign neoplasm of cerebellum
\Finding of head and neck region\Head finding (finding)\Mass of head (finding)\Intracranial mass\Mass lesion of brain (finding)\Neoplasm of brain\Benign neoplasm of brain\Benign neoplasm of infratentorial brain (disorder)\Benign neoplasm of cerebellum
\Finding of head and neck region\Head finding (finding)\Mass of head (finding)\Intracranial mass\Intracranial tumour\Neoplasm of brain\Neoplasm of cerebellum\Benign neoplasm of cerebellum
\Finding of head and neck region\Head finding (finding)\Mass of head (finding)\Intracranial mass\Intracranial tumour\Neoplasm of brain\Benign neoplasm of brain\Benign neoplasm of infratentorial brain (disorder)\Benign neoplasm of cerebellum
\Finding of head and neck region\Head finding (finding)\Finding of brain\Mass lesion of brain (finding)\Neoplasm of brain\Neoplasm of cerebellum\Benign neoplasm of cerebellum
\Finding of head and neck region\Head finding (finding)\Finding of brain\Mass lesion of brain (finding)\Neoplasm of brain\Benign neoplasm of brain\Benign neoplasm of infratentorial brain (disorder)\Benign neoplasm of cerebellum
\Finding of head and neck region\Head finding (finding)\Finding of brain\Disorder of brain (disorder)\Lesion of brain\Neoplasm of brain\Neoplasm of cerebellum\Benign neoplasm of cerebellum
\Finding of head and neck region\Head finding (finding)\Finding of brain\Disorder of brain (disorder)\Lesion of brain\Neoplasm of brain\Benign neoplasm of brain\Benign neoplasm of infratentorial brain (disorder)\Benign neoplasm of cerebellum
\Finding of head and neck region\Head finding (finding)\Finding of brain\Disorder of brain (disorder)\Cerebellar disorder\Neoplasm of cerebellum\Benign neoplasm of cerebellum
\Finding of head and neck region\Head finding (finding)\Disorder of head (disorder)\Neoplasm of head\Intracranial tumour\Neoplasm of brain\Neoplasm of cerebellum\Benign neoplasm of cerebellum
\Finding of head and neck region\Head finding (finding)\Disorder of head (disorder)\Neoplasm of head\Intracranial tumour\Neoplasm of brain\Benign neoplasm of brain\Benign neoplasm of infratentorial brain (disorder)\Benign neoplasm of cerebellum
\Finding of head and neck region\Head finding (finding)\Disorder of head (disorder)\Neoplasm of head\Benign neoplasm of head\Benign neoplasm of brain\Benign neoplasm of infratentorial brain (disorder)\Benign neoplasm of cerebellum
\Finding of head and neck region\Head finding (finding)\Disorder of head (disorder)\Disorder of brain (disorder)\Lesion of brain\Neoplasm of brain\Neoplasm of cerebellum\Benign neoplasm of cerebellum
\Finding of head and neck region\Head finding (finding)\Disorder of head (disorder)\Disorder of brain (disorder)\Lesion of brain\Neoplasm of brain\Benign neoplasm of brain\Benign neoplasm of infratentorial brain (disorder)\Benign neoplasm of cerebellum
\Finding of head and neck region\Head finding (finding)\Disorder of head (disorder)\Disorder of brain (disorder)\Cerebellar disorder\Neoplasm of cerebellum\Benign neoplasm of cerebellum
\Finding of head and neck region\Mass of head and/or neck (finding)\Mass of head (finding)\Neoplasm of head\Intracranial tumour\Neoplasm of brain\Neoplasm of cerebellum\Benign neoplasm of cerebellum
\Finding of head and neck region\Mass of head and/or neck (finding)\Mass of head (finding)\Neoplasm of head\Intracranial tumour\Neoplasm of brain\Benign neoplasm of brain\Benign neoplasm of infratentorial brain (disorder)\Benign neoplasm of cerebellum
\Finding of head and neck region\Mass of head and/or neck (finding)\Mass of head (finding)\Neoplasm of head\Benign neoplasm of head\Benign neoplasm of brain\Benign neoplasm of infratentorial brain (disorder)\Benign neoplasm of cerebellum
\Finding of head and neck region\Mass of head and/or neck (finding)\Mass of head (finding)\Intracranial mass\Mass lesion of brain (finding)\Neoplasm of brain\Neoplasm of cerebellum\Benign neoplasm of cerebellum
\Finding of head and neck region\Mass of head and/or neck (finding)\Mass of head (finding)\Intracranial mass\Mass lesion of brain (finding)\Neoplasm of brain\Benign neoplasm of brain\Benign neoplasm of infratentorial brain (disorder)\Benign neoplasm of cerebellum
\Finding of head and neck region\Mass of head and/or neck (finding)\Mass of head (finding)\Intracranial mass\Intracranial tumour\Neoplasm of brain\Neoplasm of cerebellum\Benign neoplasm of cerebellum
\Finding of head and neck region\Mass of head and/or neck (finding)\Mass of head (finding)\Intracranial mass\Intracranial tumour\Neoplasm of brain\Benign neoplasm of brain\Benign neoplasm of infratentorial brain (disorder)\Benign neoplasm of cerebellum
\Finding of head and neck region\Mass of head and/or neck (finding)\Neoplasm of head and neck\Benign tumour of head and neck\Benign neoplasm of head\Benign neoplasm of brain\Benign neoplasm of infratentorial brain (disorder)\Benign neoplasm of cerebellum
\Finding of head and neck region\Mass of head and/or neck (finding)\Neoplasm of head and neck\Neoplasm of head\Intracranial tumour\Neoplasm of brain\Neoplasm of cerebellum\Benign neoplasm of cerebellum
\Finding of head and neck region\Mass of head and/or neck (finding)\Neoplasm of head and neck\Neoplasm of head\Intracranial tumour\Neoplasm of brain\Benign neoplasm of brain\Benign neoplasm of infratentorial brain (disorder)\Benign neoplasm of cerebellum
\Finding of head and neck region\Mass of head and/or neck (finding)\Neoplasm of head and neck\Neoplasm of head\Benign neoplasm of head\Benign neoplasm of brain\Benign neoplasm of infratentorial brain (disorder)\Benign neoplasm of cerebellum

\Disease\Neoplasm and/or hamartoma (disorder)\Neoplastic disease\Neoplasm of head and neck\Benign tumour of head and neck\Benign neoplasm of head\Benign neoplasm of brain\Benign neoplasm of infratentorial brain (disorder)\Benign neoplasm of cerebellum
\Disease\Neoplasm and/or hamartoma (disorder)\Neoplastic disease\Neoplasm of head and neck\Neoplasm of head\Intracranial tumour\Neoplasm of brain\Neoplasm of cerebellum\Benign neoplasm of cerebellum
\Disease\Neoplasm and/or hamartoma (disorder)\Neoplastic disease\Neoplasm of head and neck\Neoplasm of head\Intracranial tumour\Neoplasm of brain\Benign neoplasm of brain\Benign neoplasm of infratentorial brain (disorder)\Benign neoplasm of cerebellum
\Disease\Neoplasm and/or hamartoma (disorder)\Neoplastic disease\Neoplasm of head and neck\Neoplasm of head\Benign neoplasm of head\Benign neoplasm of brain\Benign neoplasm of infratentorial brain (disorder)\Benign neoplasm of cerebellum
\Disease\Neoplasm and/or hamartoma (disorder)\Neoplastic disease\Neoplasm of nervous system\Neoplasm of central nervous system\Neoplasm of brain\Neoplasm of cerebellum\Benign neoplasm of cerebellum
\Disease\Neoplasm and/or hamartoma (disorder)\Neoplastic disease\Neoplasm of nervous system\Neoplasm of central nervous system\Neoplasm of brain\Benign neoplasm of brain\Benign neoplasm of infratentorial brain (disorder)\Benign neoplasm of cerebellum
\Disease\Neoplasm and/or hamartoma (disorder)\Neoplastic disease\Neoplasm of nervous system\Neoplasm of central nervous system\Benign neoplasm of central nervous system\Benign neoplasm of brain\Benign neoplasm of infratentorial brain (disorder)\Benign neoplasm of cerebellum
\Disease\Neoplasm and/or hamartoma (disorder)\Neoplastic disease\Neoplasm of nervous system\Benign neoplasm of nervous system\Benign neoplasm of central nervous system\Benign neoplasm of brain\Benign neoplasm of infratentorial brain (disorder)\Benign neoplasm of cerebellum
\Disease\Neoplasm and/or hamartoma (disorder)\Neoplastic disease\Benign neoplastic disease\Benign tumour of head and neck\Benign neoplasm of head\Benign neoplasm of brain\Benign neoplasm of infratentorial brain (disorder)\Benign neoplasm of cerebellum
\Disease\Neoplasm and/or hamartoma (disorder)\Neoplastic disease\Benign neoplastic disease\Benign neoplasm of nervous system\Benign neoplasm of central nervous system\Benign neoplasm of brain\Benign neoplasm of infratentorial brain (disorder)\Benign neoplasm of cerebellum
\Disease\Disorder of body system\Disorder of nervous system (disorder)\Neoplasm of nervous system\Neoplasm of central nervous system\Neoplasm of brain\Neoplasm of cerebellum\Benign neoplasm of cerebellum
\Disease\Disorder of body system\Disorder of nervous system (disorder)\Neoplasm of nervous system\Neoplasm of central nervous system\Neoplasm of brain\Benign neoplasm of brain\Benign neoplasm of infratentorial brain (disorder)\Benign neoplasm of cerebellum
\Disease\Disorder of body system\Disorder of nervous system (disorder)\Neoplasm of nervous system\Neoplasm of central nervous system\Benign neoplasm of central nervous system\Benign neoplasm of brain\Benign neoplasm of infratentorial brain (disorder)\Benign neoplasm of cerebellum
\Disease\Disorder of body system\Disorder of nervous system (disorder)\Neoplasm of nervous system\Benign neoplasm of nervous system\Benign neoplasm of central nervous system\Benign neoplasm of brain\Benign neoplasm of infratentorial brain (disorder)\Benign neoplasm of cerebellum
\Disease\Disorder of body system\Disorder of nervous system (disorder)\Disorder of the central nervous system (disorder)\Neoplasm of central nervous system\Neoplasm of brain\Neoplasm of cerebellum\Benign neoplasm of cerebellum
\Disease\Disorder of body system\Disorder of nervous system (disorder)\Disorder of the central nervous system (disorder)\Neoplasm of central nervous system\Neoplasm of brain\Benign neoplasm of brain\Benign neoplasm of infratentorial brain (disorder)\Benign neoplasm of cerebellum
\Disease\Disorder of body system\Disorder of nervous system (disorder)\Disorder of the central nervous system (disorder)\Neoplasm of central nervous system\Benign neoplasm of central nervous system\Benign neoplasm of brain\Benign neoplasm of infratentorial brain (disorder)\Benign neoplasm of cerebellum
\Disease\Disorder of body system\Disorder of nervous system (disorder)\Disorder of the central nervous system (disorder)\Disorder of brain (disorder)\Lesion of brain\Neoplasm of brain\Neoplasm of cerebellum\Benign neoplasm of cerebellum
\Disease\Disorder of body system\Disorder of nervous system (disorder)\Disorder of the central nervous system (disorder)\Disorder of brain (disorder)\Lesion of brain\Neoplasm of brain\Benign neoplasm of brain\Benign neoplasm of infratentorial brain (disorder)\Benign neoplasm of cerebellum
\Disease\Disorder of body system\Disorder of nervous system (disorder)\Disorder of the central nervous system (disorder)\Disorder of brain (disorder)\Cerebellar disorder\Neoplasm of cerebellum\Benign neoplasm of cerebellum
\Disease\Disorder of head (disorder)\Neoplasm of head\Intracranial tumour\Neoplasm of brain\Neoplasm of cerebellum\Benign neoplasm of cerebellum
\Disease\Disorder of head (disorder)\Neoplasm of head\Intracranial tumour\Neoplasm of brain\Benign neoplasm of brain\Benign neoplasm of infratentorial brain (disorder)\Benign neoplasm of cerebellum
\Disease\Disorder of head (disorder)\Neoplasm of head\Benign neoplasm of head\Benign neoplasm of brain\Benign neoplasm of infratentorial brain (disorder)\Benign neoplasm of cerebellum
\Disease\Disorder of head (disorder)\Disorder of brain (disorder)\Lesion of brain\Neoplasm of brain\Neoplasm of cerebellum\Benign neoplasm of cerebellum
\Disease\Disorder of head (disorder)\Disorder of brain (disorder)\Lesion of brain\Neoplasm of brain\Benign neoplasm of brain\Benign neoplasm of infratentorial brain (disorder)\Benign neoplasm of cerebellum
\Disease\Disorder of head (disorder)\Disorder of brain (disorder)\Cerebellar disorder\Neoplasm of cerebellum\Benign neoplasm of cerebellum

Status: current, Sufficiently defined by necessary conditions definition status (core metadata concept). Date: 31-Jan 2002. Module: SNOMED CT core

Descriptions:

Id Description Lang Type Status Case? Module

152457015 Benign neoplasm of cerebellum en Synonym (core metadata concept) Active Entire term case insensitive (core metadata concept) SNOMED CT core

835492018 Benign neoplasm of cerebellum (disorder) en Fully specified name Active Entire term case insensitive (core metadata concept) SNOMED CT core

1853721000052111 benign tumör i lillhjärnan sv Synonym (core metadata concept) Active Entire term case insensitive (core metadata concept) SNOMED CT Sweden NRC maintained module (core metadata concept)

Expanded Value Set

Outbound Relationships	Type	Target	Active	Characteristic	Refinability	Group	Values
Benign neoplasm of cerebellum	Is a	Neoplasm of cerebellum	true	Inferred relationship	Some
Benign neoplasm of cerebellum	Is a	Benign neoplasm of brain	false	Inferred relationship	Some
Benign neoplasm of cerebellum	Associated morphology	Neoplasm, benign	false	Inferred relationship	Some	1
Benign neoplasm of cerebellum	Associated morphology	Neoplasm, benign	false	Inferred relationship	Some	15
Benign neoplasm of cerebellum	Pathological process	Neoplastic process	false	Inferred relationship	Some
Benign neoplasm of cerebellum	Pathological process	Benign neoplastic process	false	Inferred relationship	Some
Benign neoplasm of cerebellum	Finding site	Brain structure	false	Inferred relationship	Some	15
Benign neoplasm of cerebellum	Finding site	oklart topografiskt ställe	false	Inferred relationship	Some
Benign neoplasm of cerebellum	Finding site	Cerebellar structure	false	Inferred relationship	Some	1
Benign neoplasm of cerebellum	Associated morphology	degeneration	false	Inferred relationship	Some	3
Benign neoplasm of cerebellum	Finding site	Cerebellar structure	false	Inferred relationship	Some	2
Benign neoplasm of cerebellum	Finding site	Cerebellar structure	true	Inferred relationship	Some	1
Benign neoplasm of cerebellum	Associated morphology	Neoplasm, benign	true	Inferred relationship	Some	1
Benign neoplasm of cerebellum	Is a	Benign neoplasm of infratentorial brain (disorder)	true	Inferred relationship	Some

Inbound Relationships	Type	Active	Source	Characteristic	Refinability	Group
Erythrocytosis due to cerebellar hemangioma	Is a	False	Benign neoplasm of cerebellum	Inferred relationship	Some
Cerebellopontine angle meningioma	Is a	True	Benign neoplasm of cerebellum	Inferred relationship	Some

This concept is not in any reference sets