&;Gas&; in the tissue should be differenciates with

.*clostridial organisms can cause Extensive necrosis of muscle with production of gas (hydrogen sulphide; nitrogen; carbon dioxide) which stains the muscle brown or black. * Usually muscle is involved from origin to inseion. * Often may extend into thoracic and abdominal muscles. * When it affects the liver it causes necrosis with frothy blood--foaming liver, is characteristic..Non clostridial gas producing organisms like coliforms can also cause gas .gangrene. ref:SRB&;S manual of surgery,ed 3,pg no 45