Table 1. The main composition of prostatic calculi.

Deposition	Prostatic calculi		Corpora amylacea
	No. of sample	Percent	No. of sample	Percent
Calcium phosphate (hydroxyapatite)	19/23	82.6	1/4	25.0
Calcium phosphate (hydroxyapatite) Co-deposited with calcium oxalate monohydrate (granular whewellite)	1/23	4.4	1/4	25.0
Calcium carbonate phosphate (carbonate apatite)	2/23	8.7	0/4	0
Calcium oxalate monohydrate (whewellite)	1/23	4.4	0/4	0

Data from Sfanos et al. Proc Natl Acad Sci USA 2009;106:3443-8) [9].