Figure 1.

1. Symphysis angle defined as angle between the long axis of the symphysis pubis and the horizontal (Mid-sagittal T2-weighted image)

2. Apical depth of prostate: Vertical measurement from the most proximal margin of the symphysis pubis to the level of the distal margin of the prostatic apex (Mid-sagittal T2-weighted image)

3. Maximum height of the prostate measured from prostate base to apex at any level (Mid-sagittal T2-weighted image)

4. Lower conjugate of pelvic midplane defined as distance from lower inner symphysis pubis to sacrococcygeal junction (Mid-sagittal T2-weighted image)

5. Bony femoral width defined as bony width of the pelvis at the mid femoral head level (Axial T1-weighted image)

6. Urethra width defined as maximal diameter of the urethra (Axial T2-weighted image)

7. Outer levator distance defined as distance from the outer border of the levator muscles measured at the same level as inner levator distance (Axial T2-weighted image)

8. Inner levator distance defined as narrowest distance from the inner border of the levator muscle to the urethra below the caudal margin of the prostatic apex (Axial T2-weighted image)

9. Urethral length measured from the apex of the prostate to the base of the urethral bulbus (Coronal T2-weighted image)

10. Maximal prostate width (Axial T2-weighted image)

11. Maximal prostate length measured at the same level as maximal width measurement (Axial T2-weighted image)