Tuberous Sclerosis

Tuberous sclerosis is the secret ingredient to get benign tumors to grow in your kidneys. Other tumor playgrounds include the brain, heart, eyes, lungs, and skin, but I only have the artistic talent to draw a bean.

Tuberous most definitely means "potato-ey" and sclerosis, like any other word starting with three consonants, means something real bad. Bad potatoes = tumors. Medicine is easy.