Necrotizing fasciitis: unreliable MRI findings in the preoperative diagnosis

Area of Science:

• Radiology
• Musculoskeletal Imaging
• Infectious Diseases

Background:

• Necrotizing fasciitis (NF) is a severe soft tissue infection.
• Dermatomyositis and posttraumatic muscle injury are distinct conditions affecting muscles.
• Magnetic resonance imaging (MRI) is a key diagnostic tool for soft tissue abnormalities.

Observation:

• Two cases of NF, one dermatomyositis, and one posttraumatic muscle injury exhibited similar MRI findings.
• Involvement of skin, subcutaneous fat, superficial and deep fasciae, and muscles was noted across these diverse conditions.
• MRI findings in these cases were nonspecific, lacking unique indicators for each condition.

Findings:

• The study identified overlapping magnetic resonance imaging (MRI) features in necrotizing fasciitis, dermatomyositis, and posttraumatic muscle injury.
• Similar patterns of involvement in superficial and deep fascial planes and musculature were observed.
• Nonspecificity of MRI findings necessitates careful consideration of differential diagnoses.

Implications:

• Radiologists must exercise caution when interpreting MRI scans showing soft tissue abnormalities.
• Preoperative decision-making should prioritize clinical evolution over potentially ambiguous MRI findings.
• Accurate differentiation of NF from other myopathies on MRI remains challenging, underscoring the importance of integrated clinical and imaging assessment.