Clinical Scorecard: Influence of the PI-QUAL MRI Quality Assessment on Histopathological Up-Staging from MRI Fusion Biopsy to Final Prostatectomy Results

At a Glance

Key Highlights

• PI-QUAL score is a 5-point Likert scale assessing mpMRI diagnostic quality: 1–2 non-diagnostic, 3 sufficient, 4–5 optimal.
• Higher PI-QUAL scores correlate with improved concordance between radiological T-stage and pathological T-stage after radical prostatectomy.
• Poor mpMRI quality (PI-QUAL 1–2) may lead to underestimation of tumor extent, affecting surgical planning and oncologic outcomes.

Guideline-Based Recommendations

Diagnosis

• Use standardized mpMRI protocols including T1WI, T2WI, DWI, and DCE sequences for prostate imaging.
• Apply PI-RADS version 2.0 or 2.1 for lesion assessment.
• Assess mpMRI quality using the PI-QUAL scoring system to ensure diagnostic reliability before biopsy.

Management

• Perform MRI-TRUS fusion biopsy targeting suspicious lesions identified on high-quality mpMRI.
• Consider mpMRI quality when interpreting radiological staging to guide surgical planning, including nerve preservation and margin assessment.
• Exclude patients with prior hormone therapy, prostate surgery, or radiotherapy from mpMRI-based staging studies to avoid confounding.

Monitoring & Follow-up

• Evaluate concordance between radiological and pathological staging post-radical prostatectomy to assess diagnostic accuracy.
• Monitor surgical outcomes such as positive surgical margins and vesicourethral leakage in relation to mpMRI quality.

Risks

• Low-quality mpMRI (PI-QUAL 1–2) may result in under-staging and inadequate surgical planning.
• Poor imaging quality can lead to unnecessary morbidity from inaccurate biopsy targeting.
• Variability in mpMRI quality across centers may affect diagnostic consistency.

Patient & Prescribing Data

349 prostate cancer patients undergoing mpMRI, MRI-TRUS fusion biopsy, and robot-assisted radical prostatectomy

Optimal mpMRI quality (PI-QUAL 4–5) was achieved in majority (287/349) and associated with better staging accuracy; mpMRI performed on-site or off-site showed variable quality distribution.

Clinical Best Practices

• Ensure mpMRI meets technical standards and diagnostic criteria before clinical decision-making.
• Use expert radiologists with extensive prostate mpMRI experience for PI-QUAL scoring and interpretation.
• Integrate PI-QUAL assessment into routine prostate mpMRI reporting to improve diagnostic confidence.
• Discuss discrepant PI-QUAL scores between readers to reach consensus and improve reliability.
• Incorporate mpMRI quality assessment in multidisciplinary planning for prostate cancer surgery.

References

• Giganti et al. on PI-QUAL scoring system
• European Society of Urogenital Radiology/EAU Section consensus on radiological T-staging
• PRECISION trial on mpMRI and prostate biopsy