Editing Prostate: Transrectal Ultrasound (section)

==TRUS Anatomy of the Prostate==
*Traditionally described based on a pathologic zonal architecture:
**Anterior fibromuscular stroma (FS), which is devoid of glandular tissue
**Transition zone (TZ)
**Central zone (CZ)
**Peripheral zone (PZ)
**Periurethral zone
**See [https://radiologykey.com/transrectal-ultrasound-of-the-prostate/#Fig6 Figure 1] and [https://i0.wp.com/abdominalkey.com/wp-content/uploads/2020/01/f073-001ab-9780128016480.jpg Figure 2]
**See [https://www.youtube.com/watch?v=HF43Ylc3qmM video] on GU Sonography of the Urinary Bladder, Scrotum & Prostate
*'''Peripheral zone and central zone cannot be distinguished from each other on TRUS, and are often collectively referred to as the "peripheral zone" on TRUS'''
*'''<span style="color:#ff0000">Peripheral zone is used as the reference for isoechoic</span>'''
**'''<span style="color:#ff0000">Transition zone is generally hyperechoic (brighter) compared to the peripheral zone and central zone</span>'''
*'''Calcifications along the surgical capsule, known as the corpora amylacea, highlight the plane between the peripheral zone and transition zone'''
**'''Multiple diffuse calcifications are a normal,''' often incidental finding and represents a result of age rather than a pathologic entity