Update: Imaging of Lower Extremity Infection

Area of Science:

• Radiology
• Diabetic Foot Care
• Infectious Disease Imaging

Background:

• Pedal infections pose diagnostic challenges, particularly in diabetic patients with complicating vascular and neuropathic conditions.
• Conventional imaging like radiographs provide structural overviews, while ultrasound and CT have limited roles.
• Magnetic resonance imaging (MRI) has emerged as a preferred modality due to its high sensitivity and specificity.

Purpose of the Study:

• To highlight the diagnostic utility of MRI in evaluating pedal infections in diabetic patients.
• To emphasize the importance of identifying the communication pathway from skin ulcers to deeper structures.
• To discuss the role of MRI in assessing soft tissue infection, abscesses, and necrotic tissue.

Main Methods:

• Review of imaging findings in diabetic patients with pedal infections.
• Emphasis on the detailed anatomical information provided by MRI.
• Comparison of MRI with other imaging modalities like radiographs, ultrasound, and CT.

Main Results:

• MRI demonstrates high sensitivity and specificity in diagnosing pedal infections.
• MRI effectively visualizes the extent of soft tissue infection, abscesses, and septic tenosynovitis.
• MRI can identify communication from skin ulcers to underlying bones, joints, and tendons.

Conclusions:

• MRI is a crucial tool for diagnosing pedal infections in diabetic patients.
• Accurate assessment of infection extent and associated complications is vital for effective management.
• Radiologists must be aware of potential pitfalls such as fractures and noninfectious inflammatory conditions.