Chinese Small-Aneurysm (≤ 5 mm) Rupture Risk (Morphologic) — free guideline decision tool
This tool assesses rupture risk for ≤ 5 mm intracranial aneurysms using morphologic irregularity, aspect ratio, and size ratio, complementing PHASES.
Open guideline tool →Guideline-based
Implements the decision logic from published clinical guidelines.
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No installation. Enter the patient's values and get a guideline recommendation instantly.
Data stays local
Nothing is uploaded. Results are for licensed clinicians only.
Worked calculation
The values below come from this tool's own example placeholders and are computed server-side with the formula shown on this page, so the arithmetic can be checked quickly. It demonstrates how to substitute values only — it is not clinical advice and not a real case.
| Aneurysm height/depth | 4.0 mm |
|---|---|
| Neck width (for AR) | 2.5 mm |
| Parent-artery mean diameter (for SR) | 2.0 mm |
| Morphology | Regular |
| Hypertension | Absent |
| Location | ICA internal carotid artery |
| Smoking | Absent |
→Small-aneurysm rupture risk2 core high-risk · higher rupture risk
- Aspect ratio AR：1.60 (height/neck; ≥ 1.6 high-risk) ⚠ high
- Size ratio SR：2.00 (height/parent-artery diameter; ≥ 2 high-risk) ⚠ high
- Core high-risk features：aspect ratio AR ≥ 1.6, size ratio SR ≥ 2 (2 items)
| Aneurysm height/depth | 4.0 mm |
|---|---|
| Neck width (for AR) | 2.5 mm |
| Parent-artery mean diameter (for SR) | 2.0 mm |
| Morphology | Irregular (lobulated/daughter sac/bleb) |
| Hypertension | Present |
| Location | ACA/Pcom/posterior circulation |
| Smoking | Present |
→Small-aneurysm rupture risk3 core high-risk · higher rupture risk
- Aspect ratio AR：1.60 (height/neck; ≥ 1.6 high-risk) ⚠ high
- Size ratio SR：2.00 (height/parent-artery diameter; ≥ 2 high-risk) ⚠ high
- Core high-risk features：irregular morphology (lobulated/daughter sac), aspect ratio AR ≥ 1.6, size ratio SR ≥ 2 (3 items)
Common questions
What is Chinese Small-Aneurysm (≤ 5 mm) Rupture Risk (Morphologic)?
This tool assesses rupture risk for ≤ 5 mm intracranial aneurysms using morphologic irregularity, aspect ratio, and size ratio, complementing PHASES.
How is Chinese Small-Aneurysm (≤ 5 mm) Rupture Risk (Morphologic) calculated? What is the core formula?
Core: irregular morphology, AR (height/neck) ≥ 1.6, SR (height/parent-artery) ≥ 2. ≥ 2 core → higher risk; 1 → intermediate. Modifiers: hypertension, non-ICA location, smoking.
When is Chinese Small-Aneurysm (≤ 5 mm) Rupture Risk (Morphologic) used?
Use for small aneurysms where PHASES discriminates poorly, weighting the three strong morphologic predictors plus clinical modifiers.
What are the key clinical points for Chinese Small-Aneurysm (≤ 5 mm) Rupture Risk (Morphologic)?
Rupture risk should not be judged low by a diameter < 5 mm alone, since irregular morphology and high AR/SR strongly predict rupture (OR ~31/41/21). (original synthesis · not guideline verbatim) It is derived from Chinese-population studies as a complement to PHASES for small aneurysms. High-risk morphology favors active assessment/treatment or shorter follow-up with vessel-wall imaging.
What are the limits and cautions when using Chinese Small-Aneurysm (≤ 5 mm) Rupture Risk (Morphologic)?
For licensed clinicians and clinical researchers. Interpret results with history, investigations and local protocols; not a diagnosis or prescription, and not a substitute for multidisciplinary decision-making or local guidelines.
How is Chinese Small-Aneurysm (≤ 5 mm) Rupture Risk (Morphologic) calculated in practice? Can you show a worked example?
Inputs: Aneurysm height/depth 4.0 mm, Neck width (for AR) 2.5 mm, Parent-artery mean diameter (for SR) 2.0 mm, Morphology Regular, Hypertension Absent, Location ICA internal carotid artery, Smoking Absent → Result: Small-aneurysm rupture risk 2 core high-risk · higher rupture risk（Aspect ratio AR: 1.60 (height/neck; ≥ 1.6 high-risk) ⚠ high, Size ratio SR: 2.00 (height/parent-artery diameter; ≥ 2 high-risk) ⚠ high, Core high-risk features: aspect ratio AR ≥ 1.6, size ratio SR ≥ 2 (2 items)） Inputs: Aneurysm height/depth 4.0 mm, Neck width (for AR) 2.5 mm, Parent-artery mean diameter (for SR) 2.0 mm, Morphology Irregular (lobulated/daughter sac/bleb), Hypertension Present, Location ACA/Pcom/posterior circulation, Smoking Present → Result: Small-aneurysm rupture risk 3 core high-risk · higher rupture risk（Aspect ratio AR: 1.60 (height/neck; ≥ 1.6 high-risk) ⚠ high, Size ratio SR: 2.00 (height/parent-artery diameter; ≥ 2 high-risk) ⚠ high, Core high-risk features: irregular morphology (lobulated/daughter sac), aspect ratio AR ≥ 1.6, size ratio SR ≥ 2 (3 items)）
Run Chinese Small-Aneurysm (≤ 5 mm) Rupture Risk (Morphologic) now
This tool assesses rupture risk for ≤ 5 mm intracranial aneurysms using morphologic irregularity, aspect ratio, and size ratio, complementing PHASES.
Open guideline tool →For licensed clinicians. Not a substitute for clinical judgement.
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