It is a disease involving the defective transepithelial transport of cystine
and dibasic amino acids in the kidney
and intestine, and is one of many causes of kidney stones
. If not treated properly, the disease could cause serious damage to the kidneys and surrounding organs, and in some rare cases death. The stones may be identified by a positive nitroprusside cyanide test. The crystals are usually hexagonal, translucent, white.