Joao Lopes Dias MEd, Presenter: Nothing to Disclose

Rita Nobre Lucas MD, Abstract Co-Author: Nothing to Disclose

Nuno Vasco Costa, Abstract Co-Author: Nothing to Disclose

Cecilia Isabel Leal, Abstract Co-Author: Nothing to Disclose

Tiago Bilhim MD, Abstract Co-Author: Research Consultant, Cook Group Incorporated

Rui Mateus Marques, Abstract Co-Author: Nothing to Disclose

The authors provide a pictorial review of (1) the normal findings and (2) the signs of local tumor relapse after radical prostatectomy, brachytherapy, external beam radiotherapy and hormonal therapy.

- The use of multiparametric magnetic resonance imaging (mp-MRI) for prostate cancer has increased over the last years, mainly for detection, staging and active surveillance. However, recurrence suspicion in the set of biochemical failure is becoming a significant reason for clinicians to request mp-MRI. - Radiologists should be able to recognize the normal post-treatment MRI findings. - Fibrosis and atrophic remnant seminal vesicles after prostatectomy are common and must be differentiated from local relapse. - Moreover, brachytherapy, external beam radiotherapy and hormonal therapy tend to diffusely decrease the signal intensity of the peripheral zone on T2 weighted images (T2WI) due to the loss of water content, consequently mimicking tumor and hemorrhage. - The combination of T2WI and functional studies like diffusion weighted imaging (DWI) and dynamic contrast-enhanced (DCE) improves the identification of local relapse. - Tumor recurrence tends to restrict on diffusion images and avidly enhance after contrast administration either within or outside the gland.  

http://abstract.rsna.org/uploads/2014/14015848/14015848_iwaa.pdf

Lopes Dias, J, Lucas, R, Costa, N, Leal, C, Bilhim, T, Mateus Marques, R, Post-treated Prostate Cancer: Normal Findings and Signs of Local Relapse on Multiparametric Magnetic Resonance Imaging.  Radiological Society of North America 2014 Scientific Assembly and Annual Meeting, - ,Chicago IL. http://archive.rsna.org/2014/14015848.html