Saturday, October 16, 2010

Transrectal ultrasound videos- seminal vesicles and vas deferens:

This video shows the left vas deferens as it merges with the left seminal vesicle to form the ejaculatory duct:
                                                                        See: for more on this topic. This includes normal sonographic anatomy during TRUS (transrectal ultrasound) imaging for the prostate, seminal vesicles, vas deferens and the ejaculatory ducts. Of these the prostate is the largest and most obvious structure seen. In the oblique coronal plane, whilst angling the transrectal/ endocavity ultrasound probe upwards, one sees the 2 seminal vesicles seen resembling a bow tie. Further tilting the probe upwards reveals the vas deferens - 2 narrow tubes joining the seminal vesicles. The ejaculatory ducts are often difficult to see unless dilated due to pathology.                   

The above endocavity (transrectal) ultrasound video shows the right vas deferens merging similarly with the right seminal vesicle.
The ultrasound video clip below visualizes the seminal vesicles and vas of both sides:

And finally, imaging the prostate from the apex (or lower tip) and sweeping upwards towards the seminal vesicles. This way one sees almost every region of interest in TRUS study.
                                                                 Another important view is the sagittal section of the prostate which shows the posterior urethra or prostatic urethra as it is known. This view is also important to show potential calculi within the prostatic urethra, as also prostatic cysts in relation to it. Pressure on this part of the urethra can cause mild to severe urinary symptoms, usually caused by either of the pathologies mentioned above.

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