Urogenital Imaging

Agenesis, seminal vesicles

absence of the seminal vesicles. This can be unilateral or bilateral. Unilateral agenesis is frequently associated with ipsilateral agenesis of the ductus deferens and with renal agenesis. The contralateral seminal vesicle is often hypoplastic. Bilateral seminal vesicle agenesis is rare. On either endorectal ultrasound or MRI, the diagnosis is made when no seminal vesicle tissue can be found within the fibrous adipose tissue between the bladder base and the rectum. On MRI, agenesis of the seminal vesicles is best depicted on T1-weighted images, but for complete evaluation, both T1- and T2-weighted images are needed (Fig.1).

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Fig.1

Axial T2-weighted MRI section showing absence of the left seminal vesicle.
Agenesis, seminal vesicles, Fig.1