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MRI of periprostatic venous plexus in staging of early prostatic carcinoma
P Y Poon1, R W McCallum, R M Henkelman
1Department of Diagnostic Radiology, University of Toronto.
Abstract:
The periprostatic venous plexus can be observed as a bright rim in coronal magnetic resonance (MR) images obtained by spin-echo (SE) 2060/60 technique. A carcinoma of the prostate which penetrates through the capsule into the periprostatic tissues interrupts or obliterates this rim, whereas an intact rim indicates that the tumor is confined within the prostatic capsule. One hundred patients with proven prostatic carcinoma were prospectively imaged by MR to detect periprostatic involvement. The results were compared with those obtained by cystoscopy and digital rectal examination under general anesthesia. The imaging and clinical methods agreed with each other in 76% of the patients.
Insights
Magnetic resonance (MR) imaging can detect prostate cancer spread by observing the periprostatic venous plexus. An intact bright rim on MR scans indicates the tumor is confined, aiding in staging prostate cancer.
Area of Science:
- Radiology
- Oncology
- Medical Imaging
Background:
- The periprostatic venous plexus appears as a bright rim in specific magnetic resonance (MR) imaging sequences.
- Tumor invasion through the prostatic capsule disrupts this venous plexus rim.
- Accurate staging of prostate cancer is crucial for treatment planning.
Purpose of the Study:
- To evaluate the effectiveness of MR imaging in detecting periprostatic tissue involvement in prostate cancer.
- To compare MR imaging findings with clinical examinations for assessing tumor extent.
Main Methods:
- Prospective MR imaging (spin-echo 2060/60 technique) of 100 patients with confirmed prostate carcinoma.
- Coronal MR images were analyzed for the integrity of the periprostatic venous plexus bright rim.
- Results were compared with digital rectal examination and cystoscopy findings.
Main Results:
- An intact bright rim on MR images correlated with tumors confined within the prostatic capsule.
- Disruption or obliteration of the rim indicated capsular penetration.
- Agreement between MR imaging and clinical methods was observed in 76% of patients.
Conclusions:
- MR imaging is a valuable tool for assessing periprostatic involvement in prostate cancer.
- The integrity of the periprostatic venous plexus rim on MR scans can help differentiate between localized and locally advanced disease.
- MR imaging shows promise in improving the accuracy of prostate cancer staging.