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Deep dorsal vein of penis

The deep dorsal vein of the penis is the principal midline venous trunk that drains blood from the erectile tissues of the penis, primarily the glans penis and corpora cavernosa, and channels it into the prostatic venous plexus. It lies in the dorsal midline of the penis, deep to Buck’s fascia and between the paired dorsal arteries.

This vein plays a crucial role in detumescence, regulating venous outflow after erection. Its close relation to the suspensory ligament of the penis, dorsal neurovascular bundle, and pubic symphysis makes it a key structure during urologic surgeries and trauma evaluation.

Synonyms

  • Deep dorsal penile vein

  • Median dorsal vein of penis

Origin, Course, and Termination

Origin:

  • Formed by multiple venous channels emerging from the glans penis, corpora cavernosa, and circumflex veins.

Course:

  • Ascends in the dorsal midline of the penis

  • Lies deep to Buck’s fascia and superficial to tunica albuginea

  • Runs between the paired dorsal arteries

  • Passes beneath the pubic symphysis

Termination:

  • Drains into the prostatic venous plexus (Santorini’s plexus) after passing through or under the suspensory ligament of the penis.

Relations

  • Superiorly: Dorsal surface of penis and skin

  • Inferiorly: Tunica albuginea of corpora cavernosa

  • Laterally: Paired dorsal penile arteries and dorsal penile nerves

  • Proximally: Suspensory ligament of the penis and pubic symphysis

  • Distally: Glans penis and subtunical venous plexus

Function

  • Provides major venous drainage of glans and corpora cavernosa

  • Essential for detumescence, allowing venous outflow after erection

  • Helps regulate pressure within erectile tissues

  • Connects penile venous drainage to pelvic venous system

Clinical Significance

  • Important in venogenic erectile dysfunction when incompetent valves cause venous leak

  • Vulnerable in penile trauma and fractures

  • Frequently encountered during penile prosthesis, Peyronie’s disease, and urethral reconstruction surgery

  • Can be compressed in pelvic fractures affecting detumescence

  • Serves as a radiologic landmark in MRI of the penis

MRI Appearance

T1-weighted images:

  • Lumen appears low signal (flow void) when blood flow is normal

  • Surrounding Buck’s fascia and subcutaneous fat appear bright

  • Venous wall is minimally visible as a thin low-signal line

T2-weighted images:

  • Shows a dark flow void similar to T1

  • Slow flow may appear as slightly higher intraluminal signal

  • Surrounding erectile tissues (corpora cavernosa/spongiosum) show intermediate signal

STIR:

  • Vein remains dark because flowing blood suppresses

  • Fat-suppressed erectile tissues and fascia provide strong contrast

DWI (Diffusion-Weighted Imaging):

  • Normal vein: no restricted diffusion, low signal due to flow

  • Adjacent penile soft tissues show normal diffusion patterns

T1 Fat-Saturated Post-Contrast:

  • Vein enhances brightly and uniformly due to contrast-filled lumen

  • Walls remain thin and low signal

  • Penile vascular anatomy becomes more conspicuous

  • Excellent for showing continuity with the prostatic plexus

CT Appearance

Non-Contrast CT:

  • Vein appears as soft-tissue density, difficult to distinguish without surrounding fat planes

  • May be visible as a small tubular structure deep to penile fascia

  • Pubic symphysis and corpora cavernosa provide anatomic landmarks

Post-Contrast CT:

  • Deep dorsal vein enhances brilliantly as a contrast-filled vessel

  • Subtle venous anatomy becomes well defined

  • Shows its passage beneath pubic symphysis toward the prostatic venous plexus

  • Useful in penetrating trauma, pelvic injury, or preoperative mapping

MRI images

Deep Dorsal Vein of Penis

MRI image

Deep dorsal vein of penis MRI axial image-img-00000-00000