Incidental Hippocampal Hyperintensity on Diffusion-weighted MRI: Individual Susceptibility to Transient Global Amnesia  

Oleh:

Jeong, Moonyoung ; Jin, Jaehyun ; Kim, Jeong Hee ; Moon, Yeonsil ; Choi, Jin Woo ; Kim, Hahn Young

Jenis: Article from Journal - ilmiah internasional
Dalam koleksi: The Neurologist vol. 22 no. 04 (Jul. 2017), page 103-106.
Topik: Amnesia; Diffusion-Weighted MRI; Hippocampus; Transient Global Amnesia; Valsalva Maneuver
Fulltext: N06 v22 n4 p103 kelik2017.pdf (122.98KB)

Ketersediaan

Perpustakaan FK Nomor Panggil: N06.K Non-tandon: 1 (dapat dipinjam: 0) Tandon: tidak ada

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Isi artikel

Objectives: Dot-like hippocampal hyperintensities (HHs) on diffusion-weighted MRI (DWI) have been reported as an interesting imaging finding of transient global amnesia (TGA) that is characterized by typical anterograde amnesia. However, we found that these dot-like HHs are occasionally seen in some patients without clinical symptoms of TGA. Methods: We identified 8 patients who did not show clinical symptoms of TGA, despite the presence of hippocampal lesions on DWI (No-TGA group, n=8). For the comparison group, 16 age-matched and sex-matched patients were selected from among patients who had been diagnosed with TGA (TGA group, n=16). Results: No significant difference was found in vascular risk factors, years of education, or underlying cognitive function between the 2 groups. More than half of the patients in each group performed preceding Valsalva-associated activities. Multiple hippocampal lesions or concomitant lesions in the cingulate gyrus were found only in the TGA group. Conclusions: Dot-like HHs on DWI can be observed without the typical symptoms of TGA. Valsalva maneuver–associated activities could produce asymptomatic hippocampal lesions. The symptoms of TGA may be presented on a spectrum, from no symptoms to mild vegetative symptoms or to the typical symptoms of TGA, depending on individual susceptibility.

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