Table 1.

Comparison of Randall and Ultrasound Classifications of Benign Prostatic Hyperplasia

Randall*	Ultrasound**
I Simple bilateral	1 Bilateral TZ
II Solitary commissural	2 Retrourethral
III Bilateral & commissural	3 Bilateral TZ & retrourethral
IV Solitary subcervical	4 Solitary or multiple pedunculated
V Bilateral & subcervical	5 Pedunculated with TZ and/or retrourethral
VI Bilateral, subcervical & commissural	6 Subtrigonal/ectopic
VII Anterior	7 Other combinations

^*Randall A. Surgical pathology of prostatic obstructions. Baltimore, Williams & Wilkins, 1931

^**Wasserman NF. Benign prostatic hyperplasia: A review and ultrasound classification. Radiol Clin N AM 2006;44:689–710