(S13) a novel method for preoperative penile implant size prediction using MRI: a clinical trial

Abstract Background Penile prosthesis implantation (PPI) is the main treatment for patients with organic factor-related erectile dysfunction (ED) who did not respond to other treatments. Traditionally, diverse intraoperative techniques are used to determine penile implant size. This case series aimed to evaluate the efficacy of a novel method for preoperative penile implant size prediction using magnetic resonance imaging (MRI). Methods Thirteen Egyptian patients with refractory ED who underwent PPI were examined. Prior to surgery, a biparametric MRI of the penis was performed to measure the length of the right and left corpora cavernosum before and after prostaglandin injection. Then, during surgery, the measurements were repeated to check the accuracy of the preoperative results. Results Thirteen patients with mean age of 48.69 ± 10.19 years suffering from refractory ED were included in our series. They underwent implant surgery, five of them with inflatable (infla 10®) implant, four with malleable (tactra®), and four with malleable (rigi 10®). ANOVA test showed that there was statistically significant difference between MRI length measurements before and after prostaglandin injection in the length of both the right (mean = 192.308, VS 154.615, p = 0.011) and left corpora cavernosum (mean = 192.477 VS 164.938, p = 0.001). After prostaglandin injection, ANOVA test showed that there was not a statistically significant difference between MRI length measurement and in operative length measurement in the length of both the right (mean = 192.308, VS 187.769, p = 0.526) and left corpus cavernosum (mean = 192.477, VS 187.769, p = 0.522). Conclusion No difference was detected between MRI measurements taken before operation and the measurements taken during the operation of the length of the right and left corpora cavernosum, which shows the ability of MRI to predict the length that can be reached after implantation which could be beneficial in patient’s counselling.