For educational and reference use only. These calculators do not replace clinical judgement, local protocols, or a qualified clinician. Verify every result independently before it informs patient care.
Body imaging
PI-RADS v2.1
PI-RADS v2.1 assessment category for a single lesion. The dominant sequence depends on zone: DWI drives the peripheral zone, T2 drives the transition zone. DCE upgrades a peripheral-zone DWI-3, and DWI can upgrade a transition-zone T2-3.
PI-RADS v2.1 criteria. The 4/5 split is SIZE: a focal lesion otherwise scoring 4 becomes 5 at ≥1.5 cm in greatest dimension, or with definite extraprostatic extension. This calculator takes the score you have already assigned and does not derive it.
PI-RADS v2.1 criteria. In the transition zone a fully encapsulated nodule scores T2W 1 (made explicit in v2.1). This calculator takes the score you have already assigned and does not derive it.
Result
PI-RADS 3
Equivocal. Consider PSA density / targeted biopsy.
Formula
PZ: DWI is dominant (DCE upgrades DWI-3 → 4). TZ: T2 is dominant (T2-2 with DWI≥4 → 3; T2-3 with DWI-5 → 4). The DWI 4/5 split is ≥1.5 cm or definite extraprostatic extension.
References
Disclaimer
Per-lesion assessment requiring adequate multiparametric MRI. DCE affects only the peripheral zone. Not validated after treatment or for the central zone / anterior fibromuscular stroma. Correlate with PSA density and clinical context.
For educational and reference use only. These calculators do not replace clinical judgement, local protocols, or a qualified clinician. Verify every result independently before it informs patient care.
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