Diagnostic Ultrasound - Abdomen and Pelvis

Prostate
PROSTATE ANATOMY
Anatomy: Pelvis
Bladder
BPH in transition zone
Peripheral zone
Pseudocapsule
Periprostatic venous plexus
Urethra
Transition zone
Pseudocapsule
Neurovascular bundle
Peripheral zone
Neurovascular bundle
Transition zone
Pseudocapsule
Urethra
Peripheral zone
(Top) Transverse transabdominal ultrasound of the midprostate in a patient with BPH shows a markedly enlarged transition zone and
hyperechoic pseudocapsule. The peripheral zone is compressed posterolaterally. (Middle) Transverse TRUS of the midprostate in a
different patient with BPH. The heterogeneously enlarged transition zone expands the inner gland. The compressed central zone is not
distinguishable. The peripheral zone is compressed posteriorly. Periurethral calcifications help identify the urethra. The neurovascular
bundles course through the retroprostatic fat at the 5 and 7 o'clock positions. (Bottom) Transverse TRUS of the midprostate in a
different patient with BPH shows heterogeneous enlargement of the 2 lobes of the transition zone, which flank the urethra. Tiny cystic
spaces within the transition zone represent cystic BPH nodules vs. retention cysts, which are often indistinguishable by imaging. The
more hyperechoic peripheral zone is along the posterolateral aspects of the prostate.
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