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Sonographic findings suggestive of necrotizing fasciitis include:
- Thickening of the deep fascia
- Diffuse thickening of the overlying fatty tissue
- At least a 4 mm thick fluid layer along the deep fascia
- Dirty Shadow if gas is present
Remember the mnemonic: STAFF (subcutaneous thickening, air, and fascial fluid)
References
Castleberg E, Jenson N, Dinh VA. Diagnosis of necrotizing fascititis with bedside ultrasound: the STAFF exam. West J Emerg Med. 2014;15(1):111-3.