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Prostatic remnant after prostatectomy: MR findings and prevalence in clinical practice

American Journal of Roentgenology Nov 10, 2019

Yoshida K, et al. - Sixty-six people who underwent radical prostatectomy with pathologically proven benign prostatic remnant between 2007 and 2017 were retrospectively examined in order to assess the MR findings of prostatic remnant following prostatectomy and predict the prevalence of prostatic remnant in people that undergo MRI following prostatectomy. In 23 of 33, the prostatic remnant was detected on MRI. No visible abnormality was seen in the remaining ten. The 23 identified lesions were located in three regions ie, under the vesicourethral anastomosis (n = 5), in the bladder neck (n = 12), and posterior to the bladder (n = 6). On T2-weighted imaging, heterogeneous hyperintensity was exhibited by 17/23 lesions. Fourteen lesions on DWI explicated hyperintensity. For suspected prostate cancer recurrence, dedicated MRI studies were conducted in 2,466 people during the same period. The prevalence of exclusively benign prostate remnant and the overall prevalence of any prostate remnant discoverable on MRI was nearly 1% and 3% of that population. In conclusion, benign prostate remnant following prostatectomy happens at three prevalent sites and typically exhibits heterogeneous hyperintensity on T2-weighted imaging. Furthermore, in males who undergo MRI for suspected recurrence, the prevalence of detectable prostatic remnant was nearly 1–3%.
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