Adult polycystic kidney disease is a condition of :

Polycystic kidney disease (PKD or PCKD, also known as polycystic kidney syndrome) is a genetic disorder in which the renal tubules become structurally abnormal, resulting in the development and growth of multiple cysts within the kidney.

These cysts may begin to develop in utero, in infancy, in childhood, or in adulthood.

Cysts are non - functioning tubules filled with fluid pumped into them, which range in size from microscopic to enormous, crushing adjacent normal tubules and eventually rendering them non - functional as well