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Abstract

Single-photon emission CT findings in acute Japanese encephalitis.

K Kimura, A Dosaka, Y Hashimoto, T Yasunaga, M Uchino and M Ando
American Journal of Neuroradiology March 1997, 18 (3) 465-469;
K Kimura
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A Dosaka
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Y Hashimoto
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T Yasunaga
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M Uchino
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M Ando
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Abstract

PURPOSE To determine the usefulness of single-photon emission CT (SPECT) in the diagnosis of acute Japanese encephalitis (JE).

METHODS We examined 10 patients (six men and four women; mean age, 69 years) with viral encephalitis. We divided the cases into two groups: the JE group (n = 4) and the non-JE group (n = 6; two with herpes simplex encephalitis and four with encephalitis of unknown origin). All cases were investigated with 99mTc-hexamethylpropyleneamine oxime (HMPAO) SPECT within 15 days after the onset of symptoms. Two patients in the JE group were also examinated by SPECT at a later stage. In all cases MR imaging was performed after the SPECT study.

RESULTS In the acute stage, all patients in the JE group showed a marked increase of HMPAO uptake that matched the hyperintense area observed on MR images in the thalami and putamina bilaterally. Follow-up SPECT studies of two patients with JE revealed a decrease of HMPAO deposition in the areas of high uptake. None of the patients in the non-JE group had an increased accumulation of HMPAO in the thalami or the putamina.

CONCLUSIONS SPECT is helpful in differentiating JE from herpes simplex encephalitis and other types of encephalitis. SPECT may be useful as a diagnostic tool in the early stages of JE.

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American Journal of Neuroradiology
Vol. 18, Issue 3
1 Mar 1997
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Cite this article
K Kimura, A Dosaka, Y Hashimoto, T Yasunaga, M Uchino, M Ando
Single-photon emission CT findings in acute Japanese encephalitis.
American Journal of Neuroradiology Mar 1997, 18 (3) 465-469;

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Single-photon emission CT findings in acute Japanese encephalitis.
K Kimura, A Dosaka, Y Hashimoto, T Yasunaga, M Uchino, M Ando
American Journal of Neuroradiology Mar 1997, 18 (3) 465-469;
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