Cysts can form in the kidney for many reasons, and most such cysts are benign (non-cancerous). However, in some instances a cyst may become enlarged to the point that it causes pain, obstructs the ...

Source: Focus Medica. A condition characterized by small, oval or round thin-walled sacs with watery fluid in the kidney. This causes back pain, abdominal pain and fever. The exact cause is not ...