The Goldman system1 is used:

Injury typeAppearance
1The posterior section of the urethra is stretched. Easily seen on urethrography and may be identified on CT by elevation of the prostatic apex
2Posterior urethral injury with no involvement of the urogenital diaphragm
3Posterior urethral injury with injury of the anterior urethra (crossing the urogenital diaphragm)
4Bladder neck and proximal urethral injury
4aBladder neck injury without urethral injury but with periurethral contrast
5Anterior urethral injury only

1. Stanford M. Goldman, Carl M. Sandler, Joseph N. Corriere, Edward J. McGuire, Blunt Urethral Trauma: A Unified, Anatomical Mechanical Classification, The Journal of Urology, Volume 157, Issue 1, January 1997, Pages 85-89