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Updated: May 5, 2026
Quantitative Magnetic Resonance Imaging of Skeletal Muscle Disease
Published on: December 18, 2016
MRI in necrotizing fasciitis of the extremities
S Z Ali1, S Srinivasan, W C G Peh
1Department of Diagnostic Radiology, Khoo Teck Puat Hospital, Singapore, Singapore.
Abstract:
Necrotizing fasciitis is a life-threatening soft-tissue infection of bacterial origin, which involves mainly the deep fascia. Early recognition of this condition may be hampered by the uncommon nature of the disease and non-specificity of initial clinical signs and symptoms in less fulminant cases, making the role of imaging important. MRI is the most useful imaging modality in the diagnosis of necrotizing fasciitis. The presence of thick (>3 mm) hyperintense signal in the deep fascia (particularly intermuscular fascia) on fat-suppressed T2 weighted or short tau inversion-recovery images is an important marker for necrotizing fasciitis. Contrast enhancement of the thickened necrotic fascia can be variable, with a mixed-pattern of enhancement being more commonly encountered. Involvement of multiple musculofascial compartments increases the likelihood of necrotizing fasciitis. It is important to remember that T2-hyperintense signal in the deep fascia is not specific to necrotizing fasciitis and can also be seen in cases such as non-infective inflammatory fasciitis or muscle tear. In this pictorial essay, we aim to review the MRI findings in necrotizing fasciitis, discuss its limitations and pitfalls and identify differentiating features from non-necrotizing soft-tissue infections, such as cellulitis and infective myositis/pyomyositis, conditions which may clinically mimic necrotizing fasciitis.
Insights
Necrotizing fasciitis, a severe soft-tissue infection, is best diagnosed using magnetic resonance imaging (MRI). Key MRI findings include thickened, hyperintense deep fascia on specific sequences, aiding early detection.
Area of Science:
- Radiology
- Infectious Diseases
- Soft Tissue Pathology
Background:
- Necrotizing fasciitis is a rapidly progressing, life-threatening bacterial infection affecting deep fascia.
- Early diagnosis is challenging due to the disease's rarity and non-specific initial symptoms.
- Imaging plays a crucial role in identifying necrotizing fasciitis, especially in subtle cases.
Purpose of the Study:
- To review magnetic resonance imaging (MRI) findings characteristic of necrotizing fasciitis.
- To discuss the limitations and potential pitfalls in MRI diagnosis.
- To differentiate necrotizing fasciitis from mimics like cellulitis and infective myositis.
Main Methods:
- Review of MRI features in confirmed cases of necrotizing fasciitis.
- Analysis of signal intensity and enhancement patterns in deep fascia.
- Comparison with imaging findings in non-necrotizing soft-tissue infections.
Main Results:
- Thickened deep fascia (>3 mm) with hyperintense signal on fat-suppressed T2-weighted or STIR images is a key MRI marker.
- Variable, often mixed, contrast enhancement of necrotic fascia is observed.
- Involvement of multiple musculofascial compartments increases diagnostic likelihood.
Conclusions:
- MRI is the most valuable imaging modality for diagnosing necrotizing fasciitis.
- Specific MRI findings, like deep fascial hyperintensity and enhancement patterns, are crucial.
- Distinguishing necrotizing fasciitis from mimics requires careful evaluation of imaging features and clinical context.
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