The disappearing PI-RADS 5 prostate lesion

Area of Science:

• Radiology
• Oncology
• Urology

Background:

• Prostate Imaging Reporting and Data System version 2 (PI-RADS v2) is the standard for interpreting multiparametric MRI (mpMRI) in prostate cancer detection.
• PI-RADS v2 accurately predicts clinically significant prostate cancer in most cases.
• High PI-RADS scores (e.g., PI-RADS 5) typically indicate a high likelihood of cancer.

Observation:

• A patient presented with a PI-RADS 5 lesion on initial mpMRI.
• This lesion, indicative of a high probability of significant cancer, spontaneously disappeared over a 13-month period.
• Serial mpMRI scans documented the complete resolution of the PI-RADS 5 lesion.

Findings:

• The observed resolution of a PI-RADS 5 lesion is an exceptionally rare event.
• This case suggests that PI-RADS v2 scoring may not always reflect the definitive presence or persistence of cancer.
• The dynamic changes in MRI findings warrant further investigation into the biological behavior of prostate lesions.

Implications:

• This case highlights the need for careful consideration of PI-RADS v2 scores in clinical decision-making.
• Further research is needed to understand the mechanisms behind lesion resolution and its clinical significance.
• It may prompt re-evaluation of follow-up protocols for specific PI-RADS v2 findings.