The Citygate is any point at which the backbone transmission system connects to the local transmission and distribution system. The Citygate is not one specific, physical location. It is a virtual trading point on CGT's system.
A malignant lesion is cancerous and requires treatment. A benign lesion is not cancerous, but may still cause medical complications which lead to treatment. One reason to develop kidney lesions is because of kidney cancer, in which case a mass may be visible in the kidneys if a patient is given an ultrasound.
Nephrolithiasis is the medical term for kidney stones. One in every 20 people develop kidney stones at some point in their life. Kidney stones form when there is a decrease in urine volume and/or an excess of stone-forming substances in the urine. Dehydration is a major risk factor for kidney stone formation. Symptoms of a kidney stone include flank pain (the pain can be quite severe) and blood in the urine (hematuria). People with certain medical conditions, such as gout, and those who take certain medications or supplements are at risk for kidney stones.