Myosteatosis, a pathological fatty deposit in skeletal muscle, is another characteristic of body composition, in addition to low muscle mass, which is associated with the poor prognosis of the cancer disease, in particular a decrease in overall survival and it has recently been shown that the muscle of cancer patients contains all the more adipose tissue that severe weight loss . Several studies have shown that myosteatosis is associated with an increase in insulin resistance and therefore a decrease in proteolysis via the inhibition of insulin transport of amino acids. The fat content of the muscle may be indirectly and non-invasively studied on the basis that the adipose tissue typically attenuates the radiation applied thereto. . The value of the attenuation measurements are determined by the rate at which the radiation passes through the tissue and is expressed in Hounsfield units (HU). Muscle and adipose tissue attenuation values were defined between -190 and -30 HU .