{"schema":"https://ver.cy/schemas/card/1.0.0","id":"vr.tr.clivus","code":"thing-q4319750","url":"https://ver.cy/models/thing/q4319750/","name":"clivus","alternateNames":[],"kind":"thing","status":"published","version":"0.1.0-research.1","language":"en","classifiers":{"family":"Thing Registry","category":"Physical world and living systems","entryKind":"thing","plane":"PHY","domain":["PHY.OBJ"],"industry":[],"navPath":"","tags":[],"facets":{}},"whatItIs":"The clivus is the sloping midline surface of the internal skull base, formed by the sphenoid body and basilar part of the occipital bone, extending from the dorsum sellae to the anterior margin of the foramen magnum and lying anterior to the brainstem.","purpose":"Enable an agent to recognise the anatomical clivus, record its development, geometry and observed condition, and identify when its relationships require specialist assessment.","scope":{"in":["Anatomical identification and boundaries of the clival region","Contribution of the basisphenoid and basiocciput, including their developmental junction","Clival dimensions, contour and orientation using explicitly defined landmarks","Observed cortical integrity, internal bone appearance and anatomical variants","Spatial relationships relevant to interpreting clival abnormalities or planning specialist assessment"],"out":["Complete models of the sphenoid bone, occipital bone or skull base","Independent models of the brainstem, cranial nerves and adjacent blood vessels","The sphenoid sinus as a complete anatomical structure","Tumour, infection and fracture classifications beyond their recorded effects on the clivus","Patient diagnosis, treatment selection and operative procedures","Other uses of the name clivus, including cerebellar terminology"],"boundaries":[]},"distinguishingFeatures":["Identify a midline bony slope between the dorsum sellae and anterior foramen magnum, rather than a lateral petrous temporal surface.","Confirm that the region spans sphenoidal and occipital contributions; the basiocciput alone does not exhaust the intended scope.","Distinguish the clival region from the dorsum sellae, which supplies a superior landmark rather than the entire structure.","Confirm that the referent is skull-base bone, rather than a cerebellar structure sharing the name.","Distinguish bone assigned to the clivus from the adjacent sphenoid sinus cavity and intracranial soft tissues."],"structure":{"bundles":[{"id":"clival-identity-and-boundaries","name":"Clival identity and boundaries","description":"Establish which anatomical referent is intended and how its extent is recognised.","layers":[{"id":"anatomical-sense","name":"Anatomical sense","description":"Resolve the name against the source record and observed anatomy.","findings":[{"id":"skull-base-referent","name":"Skull-base referent","description":"Record evidence that the entry denotes the skull-base clivus.","questions":[{"text":"Does the originating registry identifier denote the skull-base clivus or another anatomical use of the word?","id":"skull-base-referent-q01","kind":"definition"},{"text":"Which terminology authority or source record establishes that interpretation?","id":"skull-base-referent-q02","kind":"provenance"}]}]},{"id":"regional-limits","name":"Regional limits","description":"Define the landmarks and tissue extent used to delimit the clivus.","findings":[{"id":"clival-boundary-convention","name":"Clival boundary convention","description":"Make surface, bone-volume and subdivision conventions explicit.","questions":[{"text":"Which superior, inferior and lateral landmarks delimit the clivus in this representation?","id":"clival-boundary-convention-q01","kind":"boundary"},{"text":"Does the annotation include underlying bone volume or only the endocranial sloping surface?","id":"clival-boundary-convention-q02","kind":"boundary"}]}]}]},{"id":"clival-development-and-variation","name":"Clival development and variation","description":"Represent developmental anatomy and variants that affect interpretation.","layers":[{"id":"spheno-occipital-development","name":"Spheno-occipital development","description":"Describe the junction between the sphenoidal and occipital contributions.","findings":[{"id":"junction-maturation","name":"Junction maturation","description":"Record observed fusion independently of assumptions based on age.","questions":[{"text":"What is the observed fusion state of the spheno-occipital synchondrosis, and how confidently is it visualised?","id":"junction-maturation-q01","kind":"measurement"},{"text":"Which age- and species-relevant evidence supports interpreting this junction appearance?","id":"junction-maturation-q02","kind":"provenance"}]}]},{"id":"clival-variants","name":"Clival variants","description":"Document unusual channels, recesses and pneumatization without assigning unsupported significance.","findings":[{"id":"variant-or-acquired-defect","name":"Variant or acquired defect","description":"Preserve the morphology and evidence needed to distinguish a variant from acquired alteration.","questions":[{"text":"Where is the channel, recess or air-containing region, and what are its margins and connections?","id":"variant-or-acquired-defect-q01","kind":"measurement"},{"text":"What evidence supports a developmental variant rather than erosion, fracture or prior intervention?","id":"variant-or-acquired-defect-q02","kind":"boundary"}]}]}]},{"id":"clival-geometry","name":"Clival geometry","description":"Capture reproducible dimensions and craniovertebral orientation.","layers":[{"id":"regional-dimensions","name":"Regional dimensions","description":"Measure the clivus at defined locations.","findings":[{"id":"landmarked-morphometry","name":"Landmarked morphometry","description":"Attach measurement definitions to length, width and thickness.","questions":[{"text":"What are the clival length and regional widths or thicknesses, in millimetres, at explicitly identified landmarks?","id":"landmarked-morphometry-q01","kind":"measurement"},{"text":"Which reconstruction plane, endpoint convention and image resolution were used?","id":"landmarked-morphometry-q02","kind":"provenance"}]}]},{"id":"craniovertebral-orientation","name":"Craniovertebral orientation","description":"Describe the clival slope relative to named cranial or cervical references.","findings":[{"id":"defined-angular-relationships","name":"Defined angular relationships","description":"Keep distinct angular constructions and positioning conditions separate.","questions":[{"text":"Which reference lines define the reported clival or clivo-axial angle, and what value was measured?","id":"defined-angular-relationships-q01","kind":"measurement"},{"text":"Was head and neck position comparable between examinations used to assess change?","id":"defined-angular-relationships-q02","kind":"provenance"}]}]}]},{"id":"clival-bone-condition","name":"Clival bone condition","description":"Describe observed changes in cortical and internal bone structure.","layers":[{"id":"cortical-and-internal-observation","name":"Cortical and internal observation","description":"Record the distribution and character of clival bone findings.","findings":[{"id":"localised-bone-appearance","name":"Localised bone appearance","description":"Describe cortical continuity and internal appearance with modality context.","questions":[{"text":"Which clival regions show cortical interruption, thinning, expansion or altered internal appearance?","id":"localised-bone-appearance-q01","kind":"measurement"},{"text":"Which CT reconstruction or MRI sequence supports each observation, and what remains unassessable?","id":"localised-bone-appearance-q02","kind":"provenance"}]}]},{"id":"change-and-attribution","name":"Change and attribution","description":"Separate longitudinal change from proposed cause.","findings":[{"id":"clival-change-history","name":"Clival change history","description":"Link interval changes to prior observations and documented clinical interpretations.","questions":[{"text":"What clival structural change is demonstrable relative to a dated, technically comparable examination?","id":"clival-change-history-q01","kind":"measurement"},{"text":"Is the proposed cause supported by a specialist report, tissue result or documented intervention, or does it remain unresolved?","id":"clival-change-history-q02","kind":"provenance"}]}]}]},{"id":"clival-interfaces-and-review","name":"Clival interfaces and review","description":"Connect clival observations to surrounding anatomy and appropriate assessment.","layers":[{"id":"adjacent-anatomy","name":"Adjacent anatomy","description":"Map relationships across the anterior, posterior and lateral clival boundaries.","findings":[{"id":"interface-involvement","name":"Interface involvement","description":"Distinguish a finding centred in the clivus from one extending into it.","questions":[{"text":"Is the observed abnormality centred within clival bone, on its surface or in an adjacent compartment?","id":"interface-involvement-q01","kind":"boundary"},{"text":"What relationships to the sphenoid sinus, dura, brainstem and nearby neurovascular structures are demonstrated rather than inferred?","id":"interface-involvement-q02","kind":"measurement"}]}]},{"id":"assessment-readiness","name":"Assessment readiness","description":"Determine whether the available anatomical evidence supports the proposed next assessment.","findings":[{"id":"clival-review-requirements","name":"Clival review requirements","description":"Expose missing anatomical information and retain specialist decision ownership.","questions":[{"text":"Which unresolved clival boundary, bone defect or adjacent-structure relationship requires qualified review?","id":"clival-review-requirements-q01","kind":"action"},{"text":"What additional imaging interpretation or anatomical annotation is needed before the proposed intervention can be assessed?","id":"clival-review-requirements-q02","kind":"action"}]}]}]},{"id":"evidence-and-external-alignment","name":"Evidence and external alignment","description":"What the world already says about this thing, gathered so the model can be checked against it.","layers":[{"id":"reported-evidence","name":"Reported evidence","description":"Findings from the breadth pass, kept separate from the structural claims.","findings":[{"id":"evidence-confidence-notes","name":"Check these first","description":"Recalled without web access and unsourced; every item is a lead to verify.","questions":[{"text":"Which of these check these first hold for the sense of clivus this model covers, and on what evidence?","id":"evidence-confidence-notes-q01","kind":"provenance"}]},{"id":"evidence-identifiers","name":"Identifiers and schemes","description":"Recalled without web access and unsourced; every item is a lead to verify.","questions":[{"text":"Which of these identifiers and schemes hold for the sense of clivus this model covers, and on what evidence?","id":"evidence-identifiers-q01","kind":"provenance"}]},{"id":"evidence-real-world-use","name":"Real-world use","description":"Recalled without web access and unsourced; every item is a lead to verify.","questions":[{"text":"Which of these real-world use hold for the sense of clivus this model covers, and on what evidence?","id":"evidence-real-world-use-q01","kind":"provenance"}]},{"id":"evidence-failure-modes-and-hazards","name":"Failure modes and hazards","description":"Recalled without web access and unsourced; every item is a lead to verify.","questions":[{"text":"Which of these failure modes and hazards hold for the sense of clivus this model covers, and on what evidence?","id":"evidence-failure-modes-and-hazards-q01","kind":"provenance"}]},{"id":"evidence-neighbours","name":"Neighbouring kinds and how to tell them apart","description":"Recalled without web access and unsourced; every item is a lead to verify.","questions":[{"text":"Which of these neighbouring kinds and how to tell them apart hold for the sense of clivus this model covers, and on what evidence?","id":"evidence-neighbours-q01","kind":"provenance"}]}]}]}]},"agentConduct":{"may":["Describe the clivus and its relations at the skull base for education, citing anatomical sources.","Explain that lesions here need specialist assessment."],"mustNot":["Diagnose a skull base tumour or fracture in a person from images or symptoms.","Share a person's imaging or records without consent.","Present surgical options as decided for a person.","Use images of identifiable patients without consent."],"requiresHuman":["Any clinical decision about a person's skull base findings.","Publishing images from a patient's records."]},"ethics":{"considerations":["Skull base conditions are serious and frightening, so information must be accurate.","Medical images are private health data."],"affectedParties":["Patients","Families","Clinicians"]},"owners":{"steward":"The person in whose body it lies; clinicians hold the records of findings.","roles":[],"masterSystems":[]},"relations":[{"target":"Q66591855","type":"parent","note":"registry parent class"}],"interaction":{"identity":{"applicability":"required","items":["Vercy registry: vr.tr.clivus","Wikidata: Q4319750 (https://www.wikidata.org/wiki/Q4319750)"]},"properties":{"applicability":"required","items":["Anatomical referent: skull-base clivus; alternative meaning; unresolved","Specimen and developmental context: linked subject or specimen, species, age and observation date","Spheno-occipital junction appearance: unfused; partially fused; fused; altered; indeterminate","Clival length: mm, with endpoints, reconstruction plane and measurement method","Regional width and thickness: mm at named levels and along specified axes","Clival orientation: degrees relative to an explicitly named reference line or plane","Cortical continuity: intact; thinned; interrupted; remodeled; indeterminate, with location","Internal bone appearance: described CT attenuation or MRI marrow signal, with protocol and regional distribution","Clival pneumatization: absent; present with mapped extent; indeterminate","Adjacent-structure relationship: named structure plus separation, contact, displacement or suspected involvement"]},"recognition":{"applicability":"required","items":["A sloping bony surface at the centre of the skull base, behind the sella and in front of the brainstem.","Seen on imaging, in dissection or in a skull specimen."]},"capabilities":{"applicability":"required","items":["Locate and annotate the clivus on an appropriately oriented anatomical image or specimen.","Measure clival dimensions and orientation with reproducible landmark definitions.","Compare developmental and structural observations across dated examinations.","Map a defect or lesion to a named clival region and record its relationship to neighbouring structures.","Flag unresolved boundaries, inadequate imaging or concerning changes for qualified review."]},"hazards":{"applicability":"required","items":["Tumours or fractures in this region that are hard to detect and treat.","Misreading of imaging by non-specialists."]},"interfaces":{"applicability":"required","items":["Terminologia Anatomica, Federative International Programme for Anatomical Terminology (FIPAT)."]},"context":{"applicability":"required","items":["The clivus is encountered in skull anatomy and medical imaging as a midline landmark at the skull base.","Its position relative to the brainstem and nearby vascular structures makes it relevant to assessment of skull-base abnormalities and specialist surgical planning."]}},"sources":[{"title":"Wikidata item Q4319750: clivus","url":"https://www.wikidata.org/wiki/Q4319750","note":"identity and sense of the item"},{"title":"Wikipedia: Clivus (anatomy)","url":"https://en.wikipedia.org/wiki/Clivus_%28anatomy%29","note":"general description of the item"}],"openQuestions":["Does the source identifier for vr.tr.clivus confirm the skull-base meaning, and is its intended scope human-only or comparative anatomy?","Does an existing Vercy world model already own this anatomical concept, requiring a registry link instead of a separate publication?","Which authoritative convention should define clival lateral boundaries, included bone volume and upper, middle and lower subdivisions?","Which population- and method-specific references support developmental interpretation and morphometric comparison without imposing universal thresholds?","What evidence is required to distinguish normal marrow or developmental variants from acquired disease when imaging remains equivocal?"],"resources":{"spec":"/models/things/publications/thing-q4319750/spec.json"},"provenance":{"origin":"thing registry research (pass 2)","builtFrom":["models/things/publications/thing-q4319750/spec.json"],"providers":["Codex"],"researchStatus":"unreviewed","generatedAt":"2026-09-12T08:45:07Z","builder":"tools/build_cards.py@1.0.0"},"completeness":{"sections":{"classifiers":"filled","whatItIs":"filled","purpose":"filled","distinguishingFeatures":"filled","structure":"filled","agentConduct":"filled","ethics":"filled","owners":"filled","relations":"filled","interaction.identity":"filled","interaction.properties":"filled","interaction.recognition":"filled","interaction.capabilities":"filled","interaction.hazards":"filled","interaction.interfaces":"filled","interaction.context":"filled","sources":"filled"},"notes":{"_gate":"Published through the thing publication gate 1.0 on 2026-10-07T10:10:31+00:00: completeness 1.00; sense: Wikidata description; 2 live sources; review by codex: pass"},"score":1.0}}