UIATS Estimate Tool (Educational)
Use this calculator to estimate whether patient and aneurysm factors trend toward treatment or conservative management in an unruptured intracranial aneurysm discussion.
What is the UIATS score?
The Unruptured Intracranial Aneurysm Treatment Score (UIATS) is a structured framework used to support decision-making for unruptured brain aneurysms. Instead of relying on a single number, UIATS weighs multiple domains:
- Patient-specific risk factors (age, comorbidity, smoking, prior hemorrhage)
- Aneurysm-specific features (size, location, morphology, growth)
- Treatment context (procedural risk and center expertise)
How this UIATS aneurysm calculator works
This page calculates two parallel totals:
- Treatment score: factors that push toward clipping/coiling/other intervention
- Conservative score: factors that support surveillance and risk-factor management
The final output uses the common practical interpretation:
- Difference ≥ 3: trend toward treatment
- Difference ≤ -3: trend toward conservative management
- -2 to +2: inconclusive zone; individualized team discussion is essential
Key factors that often influence risk discussion
1) Aneurysm size and growth
Larger aneurysms and documented interval growth are usually considered stronger reasons to consider intervention, especially when combined with irregular morphology.
2) Location and shape
Posterior circulation aneurysms and aneurysms with daughter sacs/irregular walls may carry higher concern in many clinical contexts.
3) Patient context
Age, life expectancy, blood pressure control, smoking status, and prior aneurysmal subarachnoid hemorrhage can significantly shift the balance of decision-making.
4) Procedural risk
The same aneurysm can receive different recommendations depending on local expertise, anatomy, and expected procedural morbidity at a given center.
How to use the result in practice
Use the score as a conversation starter with neurosurgery, neurointerventional radiology, and neurology teams. Bring the result together with:
- High-resolution CTA/MRA/DSA findings
- Personal values and treatment preferences
- Your center’s real complication rates
- A shared plan for follow-up intervals if observation is chosen
Important limitations
No online tool can fully capture all anatomy and patient-specific nuances. This calculator is best treated as educational support, not a diagnostic or therapeutic directive.