PIRADS 1

No abnormality (i.e. normal) on ADC and high b-value DWI.

PIRADS 2

Indistinct hypointense on ADC.

PIRADS 3

Focal mildly/moderately hypointense on ADC (arrow) and isointense/mildly hyperintense on high b-value DWI.

PIRADS 4

Focal markedly hypointense on ADC (arrow) and markedly hyperintense on high b-value DWI; < 1.5cm on axial images.

PIRADS 5

Same as 4 but ≥ 1.5cm in greatest dimension (arrow) or definite extraprostatic extension / invasive behavior.

1 2 3 4 5

TZ-DWI for PI-RADS 2