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Published on: March 21, 2025
Prostate cancer with a pseudocapsule at MR imaging: a marker of high grade and stage disease?
Apurva A Bonde1, Elena K Korngold1, Bryan R Foster1
1Department of Diagnostic, Oregon Health & Science University, 3181 SW Sam Jackson Park Road, Mail Code: L340, Portland, OR 97239.
Abstract:
Clinicopathological correlates of prostate cancer associated with a pseudocapsule at T2-weighted magnetic resonance (MR) imaging are presented in a retrospective series of 15 patients. Of 15 tumors, 14 involved the peripheral zone. Extracapsular extension was seen in 14 cases. Tumor Gleason score was 8 or above in 12 of 15 cases, and ductal type adenocarcinoma was identified in 4 cases. Step section histopathological correlation (n=5) demonstrated that the pseudocapsule corresponded with dense compressive or reactive peritumoral fibrosis. A pseudocapsule around prostate cancer at T2-weighted MR imaging is a rare finding that appears to be associated with high grade and stage disease.
Insights
A rare finding of a pseudocapsule around prostate cancer on T2-weighted magnetic resonance (MR) imaging is linked to aggressive disease. This imaging feature often indicates high-grade, advanced-stage prostate cancer with extracapsular extension.
Area of Science:
- Urology
- Radiology
- Pathology
Background:
- Prostate cancer pseudocapsules are rare findings on T2-weighted MRI.
- Understanding their clinicopathological significance is crucial for accurate staging.
Purpose of the Study:
- To correlate the presence of a prostate cancer pseudocapsule on T2-weighted MRI with clinicopathological features.
- To assess the association of this finding with tumor grade, stage, and histology.
Main Methods:
- Retrospective analysis of 15 prostate cancer patients with T2-weighted MRI.
- Correlation of MRI findings with histopathological data, including step section analysis in 5 cases.
Main Results:
- A pseudocapsule was observed in the context of prostate cancer, predominantly in the peripheral zone (14/15 tumors).
- Extracapsular extension was present in 14 cases, and high Gleason scores (≥8) were noted in 12 cases.
- Histopathological correlation identified the pseudocapsule as dense compressive or reactive peritumoral fibrosis.
Conclusions:
- A pseudocapsule on T2-weighted MRI is a rare indicator of advanced prostate cancer.
- This finding is associated with high-grade disease, advanced stage, and extracapsular extension.
