Necrotizing fasciitis (NF) is rare but potentially life threatening thus immediate diagnosis and intervention is required. NF is a rapidly spreading infection of the deeper layers of the skin, subcutaneous tissues with extension along fascial planes and subsequent necrosis. In most cases it is caused by group A streptococcus. The port of entry is often local. Parole chiave: necrotizing fasciitis - head - neck - mediastinum