What is Kidney Cyst
A cyst in kidney looks like bubble, in which there is liquid. It is a general term of renal cystic lesions. It can be single or multiple, simple or complex and it can affect unilateral kidney or bilateral kidneys. With the popularization of physical examination and wide application of B ultrasound and CT san, the detection rate of kidney cyst has had significant increase and it has become a common kidney disease in clinic. The common kidney cysts are renal cortical cyst, parapelvic kidney cysts, complex renal cyst, etc. With cysts growing, they will damage renal intrinsic cells and tissues.
Kidney cysts are almost always benign (not cancerous). Usually, the cysts don't cause any problems. In fact, people can go through life without even knowing that they have them.
Some people have kidney cysts caused by an inherited disease called polycystic kidney disease (PKD). This disease can cause symptoms such as high bloodpressure, pain in the back and side, blood in the urine or frequent kidney infections. But not all people who have PKD will have these symptoms. In contrast, Kidney Cyst is not a genetic disease.
Cysts that form on the kidneys usually contain fluid. One or more cysts may develop on small tubes in the kidneys. The simple kidney cyst is different from the cysts that develop when a person has polycystic kidney disease, which is a genetic disease. Although its cause is not fully understood, the simple cyst is not an inherited condition. Simple kidney cysts become more common as people age. Nearly 30 percent of people over the age of 70 have at least one simple kidney cyst.
Simple Renal Cyst may be congenital genetic disease, which appears one or several round cysts with different sizes on unilateral or bilateral sides which have no communication with outside world. Most of them are unilateral cysts, so it is called Simple Renal Cyst. Its morbidity may increase along with age. 50% of people over the age of 50 can be found this cyst by B-ultrasonic, and the doctors can make a definite diagnosis by B-ultrasonic and CT.
Acquired Cystic Kidney may happen after Uremia or the treatment of dialysis, which has no relationship with the age but relates to the time of hemodialysis. Kidney originally has no cyst. According to reports in the literature, most patients with the dialysis time are more than 3 years may appear cyst. One of the kidneys may at least have 4 cysts with the diameter is 2 to 3 cm. some cysts may appear infection, or even canceration. B-ultrasonic and CT can make the definite diagnosis.