Diagnostic Ultrasound - Abdomen and Pelvis

Prostate
Anatomy: Pelvis
PROSTATE, TRANSRECTAL ULTRASOUND
Transition zone
Urethra
Peripheral zone
Transition zone
Peripheral zone
Seminal vesicle
Transition zone
Ejaculatory duct
Peripheral zone
Transition zone
Urethra
Peripheral zone
Neurovascular bundle
Transition zone
Pseudocapsule
Peripheral zone
(Top) Transverse TRUS at the level of the midprostate shows the 2 lobes of the transition zone on either side of the urethra. The more
homogeneous peripheral zone is along the posterolateral aspects of the prostate. Note the periurethral calcifications. (Middle)
Parasagittal TRUS shows the ejaculatory duct emerging after fusion of the vas deferens and seminal vesicle, entering the prostate base.
The ejaculatory ducts are surrounded by the central zone, which is not readily distinguishable on TRUS. Calcifications are seen within
the more anterior transition zone. The peripheral zone runs along the posterolateral aspect of the prostate. (Bottom) Transverse TRUS
of the midprostate gland demonstrates an enlarged transition zone in a patient with benign prostatic hyperplasia (BPH). The
pseudocapsule separates the transition zone from the peripheral zone. Frequently, the pseudocapsule will be outlined by calcifications,
which represent calcified corpora amylacea (laminated bodies formed by secretions and degenerate cells).
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