Single-photon emission CT findings in acute Japanese encephalitis

Area of Science:

• Neurology
• Radiology
• Infectious Diseases

Background:

• Viral encephalitis poses diagnostic challenges.
• Differentiating Japanese encephalitis (JE) from other forms is crucial for timely treatment.

Purpose of the Study:

• To evaluate the diagnostic utility of single-photon emission CT (SPECT) in acute Japanese encephalitis (JE).

Main Methods:

• 10 patients with viral encephalitis were studied, divided into JE (n=4) and non-JE (n=6) groups.
• All patients underwent 99mTc-hexamethylpropyleneamine oxime (HMPAO) SPECT within 15 days of symptom onset.
• Magnetic Resonance (MR) imaging was performed post-SPECT.

Main Results:

• JE patients exhibited increased HMPAO uptake in bilateral thalami and putamina, correlating with MR findings.
• Follow-up SPECT showed decreased HMPAO deposition in treated JE cases.
• Non-JE patients did not display abnormal HMPAO accumulation in these brain regions.

Conclusions:

• SPECT demonstrates high HMPAO uptake in the thalami and putamina in acute JE.
• SPECT is valuable for distinguishing JE from herpes simplex encephalitis and other encephalitis types.
• SPECT shows promise as an early diagnostic tool for JE.