[Infection or Autoimmunity: Key Imaging Points for Differential Diagnosis]

Area of Science:

• Neurology
• Radiology
• Infectious Diseases

Background:

• Differentiating infectious and autoimmune encephalitis is clinically challenging.
• Magnetic resonance imaging (MRI) findings often overlap between these conditions.
• Prior treatments can alter imaging, complicating diagnosis.

Purpose of the Study:

• To review key MRI features of infectious and autoimmune encephalitis.
• To emphasize pre-treatment imaging patterns for diagnostic accuracy.
• To discuss diagnostic pitfalls and the importance of integrating imaging with clinical data.

Main Methods:

• Review of MRI findings in infectious and autoimmune encephalitis.
• Emphasis on pre-treatment imaging characteristics.
• Discussion of lesion distribution, symmetry, and temporal evolution.

Main Results:

• Infectious encephalitis: meningeal enhancement, diffusion restriction, hemorrhage, vascular changes.
• Autoimmune encephalitis: mild/nonspecific signal abnormalities, limited enhancement.
• Distinguishing features include lesion patterns and evolution.

Conclusions:

• Radiologists must integrate MRI findings with clinical and laboratory data.
• Recognizing imaging strengths and limitations is crucial for accurate diagnosis.
• Understanding typical patterns aids diagnostic reasoning and treatment strategies.