**Congenital cysts are common incidental findings in both pigs and calves. Simple cysts generally cause no problems verses polycystic kidneys which can disrupt the renal architecture and lead to compromised function. Persian cats and Cairn terriers are predisposed. | **Congenital cysts are common incidental findings in both pigs and calves. Simple cysts generally cause no problems verses polycystic kidneys which can disrupt the renal architecture and lead to compromised function. Persian cats and Cairn terriers are predisposed. |