Skeletal muscle tissue is damaged by various causes, and this causes the escape of muscle derivated substances to the blood and occurs various pathologies. This pathology is called rhabdomyolysis. Schultz classified rhabdomyolysis according to causes . Crush Syndrome is the case accompanying long-time crush by external force, ischemia, and the reperfusion injury. In Japan, it occurred to persons who had a disaster in Han-Shin Awaji Earthquake in 1995. On the other hand, the case where external force does not accompany convulsion and hyperthermia, is frequently called rhabdomyolysis (in narrow sense). The remarkable swelling of the damaged muscle compartment (muscle subdivision) occurs intravascular dehydration, and it falls to the shock state in seriousness. Renal dysfunction is complicated by nephrotoxicity of myoglobin deviating from the muscular tissue. In the blood examination, rises of CPK, myoglobin and potassium originated from collapsed muscular tissue, were recognized. In urinalysis, myoglobin rises and the reddish brown urine (port wine urine) is macroscopically shown. In the treatment, followings are patient\'s condition to need the emergent treatment: Renal disturbance by muscle derivated toxic substance such as myoglobin, intravascular dehydration with edema of the damage muscle, arrhythmia by hyperkalemia. In the crash syndrome, the lesion is comparatively easy to be distinguished from the external surface finding. However, the physical remark is scarce in non-traumatic rhabdomyolysis, and the lesion is first identified from the image examination. The computed tomography is useful for the screening, because even serious patients can comparatively easily do it. MRI examination is excellent in sharp evaluation of increase of vascular permeability and inflammation. In this report, present knowledge is outlined, such as image finding of rhabdomyolysis and the pathologic finding of the muscle.
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