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Related Experiment Videos

Radiographic appearance of the pars nuda urethrae in the voiding urethrogram

M W Stannard1, G Currarino

  • 1Department of Radiology, Children's Medical Center, Dallas, TX 75235-7794.

Abdominal Imaging
|January 1, 1993
PubMed
Summary

The pars nuda, an anterior male urethral segment, is often unclear on voiding urethrograms. However, muscular activity can sometimes make it visible, potentially mimicking abnormalities.

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Area of Science:

  • Anatomy
  • Urology
  • Radiology

Background:

  • The pars nuda is the anterior-most section of the male membranous urethra.
  • It is uniquely characterized by incomplete support from the corpus cavernosum and surrounding musculature.
  • This anatomical feature often poses challenges in standard imaging.

Purpose of the Study:

  • To describe the anatomical characteristics of the pars nuda.
  • To explain its typical appearance and potential for misinterpretation on voiding urethrograms.
  • To highlight the influence of urethral muscular activity on its visualization.

Main Methods:

  • Review of anatomical descriptions of the male urethra.
  • Analysis of imaging characteristics in voiding urethrograms.

Related Experiment Videos

  • Correlation of urethral muscular activity with pars nuda visibility.

    • Main Results:

    • The pars nuda extends from the urogenital diaphragm to the urethral bulb.
    • Incomplete corpus cavernosum and muscular support distinguish it from other urethral segments.
    • Urethral muscular activity can cause the pars nuda to appear clearly, mimicking pathology.

    Conclusions:

    • The pars nuda's unique anatomy can lead to diagnostic ambiguity on voiding urethrograms.
    • Understanding its variable appearance due to muscular activity is crucial for accurate interpretation.
    • Radiologists should be aware of this potential pitfall to avoid misdiagnosis.