🧠 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.
Chinese Small-Aneurysm (≤ 5 mm) Rupture Risk (Morphologic)
Aneurysm height/depth (mm)
Neck width (for AR) (mm)
Parent-artery mean diameter (for SR) (mm)
Morphology
Hypertension
Location
Smoking
When to use
Use for small aneurysms where PHASES discriminates poorly, weighting the three strong morphologic predictors plus clinical modifiers.
How it works
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.
Key points
- 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.
References
Decision support for licensed clinicians only; not a substitute for clinical judgement, diagnosis or local protocols.