攝護腺 (前列腺) 增生症

Often results in some degree of urinary obstruction
Occurs in 50% of men by 40s, 75% by 70s; ~4% of men over 70 have prostates larger than 100 g
Intact testes required, because hormonal stimulation necessary
Average size is 100 g; up to 800 g has been reported
Begins on inner portion of gland (periurethral)
Both glandular and stromal (fibrous and smooth muscle) hyperplasia
Inspissated secretions, calcifications, calculi (7%), corpora amylacea, infarction (20-25%)