|Year : 2019 | Volume
| Issue : 4 | Page : 424-427
Vas deferens infiltration by prostate cancer on prostate-specific membrane antigen-targeted18F-DCFPyL positron emission tomography/computed tomography: A unique visual pattern
Yafu Yin1, Channing J Paller2, Martin G Pomper3, Kenneth J Pienta4, Michael A Gorin3, Steven P Rowe5
1 The Russell H. Morgan Department of Radiology and Radiological Science, Johns Hopkins University School of Medicine, Baltimore, MD, USA; Department of Nuclear Medicine, The First Hospital of China Medical University, Shenyang, China
2 Department of Oncology, The Sidney Kimmell Comprehensive Cancer Center, Johns Hopkins University School of Medicine, Baltimore, MD, USA
3 The Russell H. Morgan Department of Radiology and Radiological Science; Department of Oncology, The Sidney Kimmell Comprehensive Cancer Center; Department of Urology, The James Buchanan Brady Urological Institute, Johns Hopkins University School of Medicine, Baltimore, MD, USA
4 Department of Oncology, The Sidney Kimmell Comprehensive Cancer Center; Department of Urology, The James Buchanan Brady Urological Institute, Johns Hopkins University School of Medicine, Baltimore, MD, USA
5 The Russell H. Morgan Department of Radiology and Radiological Science; Department of Urology, The James Buchanan Brady Urological Institute, Johns Hopkins University School of Medicine, Baltimore, MD, USA
|Date of Submission||09-May-2018|
|Date of Acceptance||30-May-2018|
|Date of Web Publication||18-Dec-2019|
Dr. Steven P Rowe
The Russell H. Morgan Department of Radiology and Radiological Science, Division of Nuclear Medicine and Molecular Imaging, Johns Hopkins University School of Medicine 600 N. Wolfe St., Baltimore, MD 21287
| Abstract|| |
New radiotracers for positron emission tomography imaging that target prostate-specific membrane antigen (PSMA) have emerged as important clinical tools for imaging prostate cancer (PCa). PSMA-targeted radiotracers have demonstrated high sensitivity and high specificity for detecting sites of PCa and are demonstrably superior to conventional imaging modalities such as computed tomography and bone scan. Vas deferens invasion is a rarely encountered poor prognostic feature of PCa. In this case report, we describe a novel pattern of radiotracer uptake in a patient with PCa imaged with PSMA-targeted18F-DCFPyL positron emission tomography/computed tomography that is consistent with diffuse vas deferens involvement.
Keywords: 18F-DCFPyL, positron emission tomography/computed tomography, prostate cancer, prostate-specific membrane, vas deferens
|How to cite this article:|
Yin Y, Paller CJ, Pomper MG, Pienta KJ, Gorin MA, Rowe SP. Vas deferens infiltration by prostate cancer on prostate-specific membrane antigen-targeted18F-DCFPyL positron emission tomography/computed tomography: A unique visual pattern. World J Nucl Med 2019;18:424-7
|How to cite this URL:|
Yin Y, Paller CJ, Pomper MG, Pienta KJ, Gorin MA, Rowe SP. Vas deferens infiltration by prostate cancer on prostate-specific membrane antigen-targeted18F-DCFPyL positron emission tomography/computed tomography: A unique visual pattern. World J Nucl Med [serial online] 2019 [cited 2020 Jan 29];18:424-7. Available from: http://www.wjnm.org/text.asp?2019/18/4/424/271127
| Introduction|| |
Prostate cancer (PCa) is the most common noncutaneous malignancy in men and is a leading cause of cancer-related deaths. A number of prognostic features of primary PCa can portend the possibility of treatment failure including high Gleason score, elevated prostate-specific antigen (PSA) level, and direct extension of the tumor beyond the confines of the prostate into the periprostatic soft tissues (pT3a) or the seminal vesicles (pT3b). Although rare, invasion of the vasa deferentia, the paired tubular structures that carry sperm from the epididymis to the urethra, is also a poor prognostic feature of PCa and also falls under the pT3b classification.
In recent years, the ability to image PCa has improved dramatically as a result of the development of multiple targeted radiotracers for positron emission tomography (PET) imaging. These agents localize to PCa by taking advantage of the metabolic properties of the tumor cells (e.g. 1-amino-3-fluorine 18-fluorocyclobutane-1-carboxylic acid) or by interactions with cell surface receptors that are overexpressed in PCa (e.g. prostate-specific membrane antigen [PSMA]-targeted radiotracers such as68 Ga-PSMA-11 and18 F-DCFPyL and gastrin-releasing peptide receptor-targeted compounds such as68 Ga-RM2). To date, the PSMA-targeted agents have been the most extensively studied and have been found to have very high sensitivities for the detection of suspected sites of PCa., Due to these high sensitivities, the PSMA PCa literature now includes reports of a number of unusual sites of recurrent or residual PCa in the pelvis.,, Herein, we report an as yet undescribed pattern of disease involvement of the vas deferens in which curvilinear radiotracer uptake outlining the intrapelvic course of the vas deferens was visualized with PSMA-targeted18 F-DCFPyL PET/computed tomography (CT).
| Case Report|| |
The patient was a 71-year-old man who was diagnosed with PCa after presenting with a PSA level of 5.5 ng/mL 5 years before undergoing PSMA-targeted imaging. A prostate biopsy at that time revealed PCa with a Gleason score of 4 + 3 = 7. The patient subsequently underwent a radical retropubic prostatectomy confirming PCa with vasa deferentia invasion, bilateral seminal vesicle invasion, multifocal extraprostatic extension, and lymphovascular invasion. In addition, the patient was found to have positive resection margins at the bilateral vas deferens and seminal vesicles. Initial PSA following prostatectomy was 0.2 ng/mL. The patient was then treated with salvage external beam radiotherapy with 8 months of combined androgen blockade. At that time, his PSA became transiently undetectable. Two years after surgery, the patient experienced a biochemical recurrence with his PSA rising to 12.2 ng/mL.
Workup for his elevated PSA included magnetic resonance imaging of the pelvis and a Na18 F PET/CT scan, neither of which demonstrated a site of disease. He was then treated on a clinical trial with degarelix and his PSA again became undetectable. However, following completion of degarelix therapy, the patient's PSA again rose to 4.1 ng/mL. This prompted an additional workup with conventional imaging including a contrast-enhanced CT of the chest, abdomen, and pelvis as well as a99m Tc-MDP bone scan, neither of which revealed radiographic evidence of disease. The patient was then enrolled in a prospective trial evaluating the clinical utility of PSMA-targeted18 F-DCFPyl PET/CT. The patient signed written informed consent prior to imaging.18 F-DCFPyL PET/CT was conducted under a Food and Drug Administration Investigational New Drug application (IND #121064) with an imaging protocol as previously described.
The uptake of18 F-DCFPyL in this patient was in a pattern not previously reported. The entire intrapelvic course of the left vas deferens was outlined with abnormal intense (maximum lean body mass-corrected standardized uptake value of 11.8) radiotracer uptake [Figure 1] and [Figure 2]. The uptake was in a curvilinear distribution extending from the left inguinal canal, through the left side of the pelvis, and ending in the left prostate bed, presumably at the site of the left vas deferens positive margin. A small focus of uptake was also present on the contralateral side and may have been related to the positive right vas deferens margin. Otherwise, no other sites of abnormal radiotracer uptake to suggest additional sites of disease were appreciated on the scan.
|Figure 1: (a) Right anterior oblique maximum intensity projection of the pelvis from a18F-DCFPyL PET scan in the 71-year-old male patient with prior history of prostatectomy and previous treatment with androgen deprivation who is described in this case report. Note the curvilinear distribution of radiotracer in the left pelvis (red arrows) that outlines the expected intrapelvic course of the left vas deferens. (b) The same maximum intensity projection as in (a) but with a red line demarcating the approximate location of the intrapelvic left vas deferens|
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|Figure 2: (a-h) Axial fused18F-DCFPyL positron emission tomography/computed tomography images of the left pelvis arranged from inferior to superior (a-d) and from superior to inferior (e-h). The uptake in the left vas deferens was in a curvilinear distribution extending from the left inguinal canal (red arrows in [a-d]), through the left side of the pelvis (red arrows in e-g), and ending in the left prostate bed (red arrow in h), presumably at the site of the left vas deferens positive margin|
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| Discussion|| |
The increasingly widespread availability of molecular imaging for the detection of sites of PCa has brought to light new patterns of recurrent, residual, and metastatic disease. It is imperative for both imaging specialists and clinicians to be aware of these patterns and to recognize their features. In this report, we describe a novel pattern of18 F-DCFPyL uptake outlining the entire intrapelvic course of the left vas deferens in a patient with history of prior prostatectomy. The curvilinear morphology of this apparent site of disease is a unique appearance that has not previously been reported. Recognition of this pattern of radiotracer uptake and its significance is important as the unusual configuration could be mistaken for an imaging artifact. Indeed, the correct interpretation of this finding can only be made in the context of an understanding of the cross-sectional anatomy of the vas deferens.
While pathologic confirmation of disease in the patient's left vas deferens is necessary to confirm the diagnosis of PCa, PSMA-targeted agents have been repeatedly shown to have exceedingly high specificities., In addition, many of the potential pitfalls for interpretation of these scans have been extensively described. As such, the possibility of a false positive, in light of the patient's known history of a positive left vas deferens surgical margin, is quite low. In the future, further careful examination of patients undergoing PSMA-targeted PET imaging for a variety of PCa-related indications will ensure that other heretofore unknown patterns of radiotracer uptake will be well described and widely known to those interpreting these scans.
Declaration of patient consent
The authors certify that they have obtained all appropriate patient consent forms. In the form the patient(s) has/have given his/her/their consent for his/her/their images and other clinical information to be reported in the journal. The patients understand that their names and initials will not be published and due efforts will be made to conceal their identity, but anonymity cannot be guaranteed.
Financial support and sponsorship
We gratefully acknowledge funding from Progenics Pharmaceuticals Inc., The Prostate Cancer Foundation Young Investigator Award, and National Institutes of Health grants CA134675 and CA183031.
Conflicts of interest
M.G.P. is a co-inventor on a US patent covering 18F-DCFPyL and as such is entitled to a portion of any licensing fees and royalties generated by this technology. This arrangement has been reviewed and approved by the Johns Hopkins University in accordance with its conflict of interest policies. M.A.G. has served as a consultant to Progenics Pharmaceuticals, the licensee of 18F-DCFPyL. K.J.P., M.G.P., M.A.G., and S.P.R. have all received research funding from Progenics Pharmaceuticals. No other authors have declared any relevant conflicts of interest.
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[Figure 1], [Figure 2]