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Does penis length will be the same after prostate removal? (2017-02-23)

After prostate removal for cancer, men sometimes complain to their doctors that their penis shrank but following men for up to two years after surgery, researchers found the patients' penises were shortest a few days after their procedures and they generally returned to normal after one year.

For the new study, the researchers measured the penis lengths of 102 men before having their prostates removed and then at 10 days after surgery and again one, three, six, nine, 12, 18 and 24 months later.

To know what caused the shortening and if any particular variable, such as the size of a man's prostate gland, would predict which men would experience this effect, based on magnetic resonance imaging (MRI) of the patients, the researchers noticed some internal changes.
Specifically, the portion of the urethra directly below the bladder moves up into the body after surgery, but moves back down after some time.

The findings may not represent reality for all men, however.
Most men will have some penis length loss after surgery and sometimes that will be permanent, said Dr. John Mulhall, who is director of the Male Sexual and Reproductive Medicine Program at Memorial Sloan Kettering Cancer Center in New York.
The loss of penis length can be attributed to two issues: muscle contractions may pull the penis into the body, but that relaxes over time, but men may also experience after surgery the loss of erection tissue, and once that muscle degenerates, itís gone.

For more information
BJUI
Changes in penile length after radical prostatectomy: investigation of the underlying anatomical mechanism
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MDN