Figure 1d. Normal prostate zonal anatomy in a 60-year-old man depicted with T2-weighted axial MR images obtained at the level of the seminal vesicles (a), the base of the prostate (b), the mid-gland (c, d), the apex (e), and the membranous urethra (f), as well as coronal (g), midsagittal (h), and parasagittal (i) MR images. The letters in g correspond to the anatomic levels used for images a-f. The vertical line in g indicates the membranous urethral length. B = urinary bladder, C = central zone, FS = anterior fibromuscular stroma, P = peripheral zone, SV = seminal vesicles, T = transition zone, U = urethra.