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PIRADS 1
PIRADS 1

No abnormality (i.e. normal) on ADC and high bvalue DWI.

PIRADS 2
PIRADS 2

Linear/wedge-shaped hypointense on ADC and/or linear/wedge-shaped hyperintense on high b-balue DWI.

PIRADS 3
PIRADS 3

Focal (discrete and different from the background) hypointense on ADC (arrow) and/or focal hyperintense on high b-value DWI; may be markedly hypointense on ADC or markedly hyperintense on high b-value DWI, but not both.

PIRADS 4
PIRADS 4

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

PIRADS 5
PIRADS 5

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