Normal prostate: chestnut shape, transverse diameter 4cm, vertical diameter 3cm, anteroposterior diameter 2cm. There is a longitudinal shallow groove in the middle of the back of the prostatic body, the prostatic sulcus.

Benign prostatic hyperplasia: first-degree hyperplasia of the prostate, enlarged prostate, the size of a simulated egg, the back of the prostate is flat, and the middle sulcus becomes shallow.

Benign prostatic hyperplasia: second-degree prostatic hyperplasia, moderately enlarged prostate, the size of a simulated duck egg, and the disappearance of the middle prostatic sulcus.

Benign prostatic hyperplasia: third-degree prostatic hyperplasia, severely enlarged prostate, regular surface, hard texture, imitating the size of a goose egg, and the bottom of the prostate cannot be touched.

Normal rectum

Rectal polyp: more solitary, most of which are pedicled polyps.

The earlier period of rectum cancer: a hard knub can be touched

The later period of rectum cancer: a bigger knub can be touched, irregular shape, and much harder than earlier period. It’s the latest development of rectum cancer.