Each tissue type, such as liver, spleen or kidney, has a particular echogenicity in its normal state. In diseased states, the echogenicity of an organ can be altered, either more echogenic (hyperechoic) or less echogenic (hypoechoic) than usual.
burn up. v. 1. To destroy something or someone by fire or heat: She burned the contract up. He burned up all the photographs. 2. To be completely destroyed by fire or heat: The cabin burned up, leaving only ashes.
A burning sensation in the knees is a symptom of several conditions, including arthritis and peripheral artery disease, a condition that occurs when the arteries become narrowed, according to Healthgrades. Burning sensations can also indicate peripheral neuropathy, a condition caused by nerve damage in the legs.