💧 Bladder VI-RADS (mpMRI Muscle Invasion)
Compute the bladder VI-RADS category (1–5) from T2, DWI and DCE mpMRI scores with the dominant-sequence rule to assess muscle invasion. Instant, browser-side.
Clinical takeaway
VI-RADS ≥ 3 suggests possible muscle invasion (≥ 4 more specific).
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When to use
Score bladder-cancer mpMRI to predict detrusor (muscle) invasion before TURBT/cystectomy decisions.
How it works
T2 (SC), DWI and DCE each scored 1–5; DWI is the dominant functional sequence (DCE-dominant when DWI is poor); overall 1 (highly unlikely) to 5 (invasion with extravesical extension).
Key points
- VI-RADS ≥ 3 suggests possible muscle invasion (≥ 4 more specific).
- DWI is dominant unless image quality is poor, when DCE takes over.
- Final staging still needs cystoscopy and pathology (TURBT/re-TURBT).
- VI-RADS ≤ 2 leans non-muscle-invasive bladder cancer.
References
Decision support for licensed clinicians only; not a substitute for clinical judgement, diagnosis or local protocols.
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.
| T2WI structural category (SC) score | 1 |
|---|---|
| DWI/ADC category score | 1 |
| DCE dynamic-enhancement category score | 1 |
| DWI image quality | Good (DWI dominant) |
→VI-RADSVI-RADS 1
- VI-RADS：VI-RADS 1: Muscle invasion highly unlikely
- Basis：Dominant sequence DWI = 1; T2 (SC) = 1, DWI = 1, DCE = 1 (T2 for first-pass/structural assessment, DWI is the dominant functional sequence, DCE dominant when DWI is poor)
- Muscle invasion：VI-RADS ≤ 2: low likelihood of muscle invasion, leans non-muscle-invasive
| T2WI structural category (SC) score | 5 |
|---|---|
| DWI/ADC category score | 5 |
| DCE dynamic-enhancement category score | 5 |
| DWI image quality | Poor (DCE dominant) |
→VI-RADSVI-RADS 5
- VI-RADS：VI-RADS 5: Muscle invasion very likely with extravesical extension (perivesical fat invasion)
- Basis：Dominant sequence DCE (DCE-dominant when DWI quality is poor) = 5; T2 (SC) = 5, DWI = 5, DCE = 5 (T2 for first-pass/structural assessment, DWI is the dominant functional sequence, DCE dominant when DWI is poor)
- Muscle invasion：VI-RADS ≥ 3: muscle invasion possible (≥ 3 highly sensitive, ≥ 4 more specific); urology/multidisciplinary assessment recommended
Frequently asked questions
- What is Bladder VI-RADS (mpMRI Muscle Invasion)?
- Compute the bladder VI-RADS category (1–5) from T2, DWI and DCE mpMRI scores with the dominant-sequence rule to assess muscle invasion. Instant, browser-side.
- How is Bladder VI-RADS (mpMRI Muscle Invasion) calculated? What is the core formula?
- T2 (SC), DWI and DCE each scored 1–5; DWI is the dominant functional sequence (DCE-dominant when DWI is poor); overall 1 (highly unlikely) to 5 (invasion with extravesical extension).
- When is Bladder VI-RADS (mpMRI Muscle Invasion) used?
- Score bladder-cancer mpMRI to predict detrusor (muscle) invasion before TURBT/cystectomy decisions.
- What are the key clinical points for Bladder VI-RADS (mpMRI Muscle Invasion)?
- VI-RADS ≥ 3 suggests possible muscle invasion (≥ 4 more specific). DWI is dominant unless image quality is poor, when DCE takes over. Final staging still needs cystoscopy and pathology (TURBT/re-TURBT). VI-RADS ≤ 2 leans non-muscle-invasive bladder cancer.
- What are the limits and cautions when using Bladder VI-RADS (mpMRI Muscle Invasion)?
- 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 Bladder VI-RADS (mpMRI Muscle Invasion) calculated in practice? Can you show a worked example?
- Inputs: T2WI structural category (SC) score 1, DWI/ADC category score 1, DCE dynamic-enhancement category score 1, DWI image quality Good (DWI dominant) → Result: VI-RADS VI-RADS 1（VI-RADS: VI-RADS 1: Muscle invasion highly unlikely, Basis: Dominant sequence DWI = 1; T2 (SC) = 1, DWI = 1, DCE = 1 (T2 for first-pass/structural assessment, DWI is the dominant functional sequence, DCE dominant when DWI is poor), Muscle invasion: VI-RADS ≤ 2: low likelihood of muscle invasion, leans non-muscle-invasive） Inputs: T2WI structural category (SC) score 5, DWI/ADC category score 5, DCE dynamic-enhancement category score 5, DWI image quality Poor (DCE dominant) → Result: VI-RADS VI-RADS 5（VI-RADS: VI-RADS 5: Muscle invasion very likely with extravesical extension (perivesical fat invasion), Basis: Dominant sequence DCE (DCE-dominant when DWI quality is poor) = 5; T2 (SC) = 5, DWI = 5, DCE = 5 (T2 for first-pass/structural assessment, DWI is the dominant functional sequence, DCE dominant when DWI is poor), Muscle invasion: VI-RADS ≥ 3: muscle invasion possible (≥ 3 highly sensitive, ≥ 4 more specific); urology/multidisciplinary assessment recommended）