Kyung-Cheon Chung

Ophthalmoplegic Migraine With Reversible Enhancement of Intraparenchymal Abducens Nerve on MRI

We describe a patient with ophthalmoplegic migraine and right abducens nerve palsy, in whom serial magnetic resonance imaging showed a transient, gadolinium‐enhancing lesion in the right lower pons, during both headache and the headache‐free period. The enhancing linear lesion was felt to represent intraparenchymal fibers of the affected abducens nerve. The possible pathophysiology of this unique finding is discussed.

Acupuncture Stimulation on GB34 Activates Neural Responses Associated with Parkinson's Disease

Parkinsons disease (PD) is a degenerative brain disorder that is caused by neural defects in the substantia nigra. Numerous studies have reported that acupuncture treatment on GB34 (Yanglingquan) leads to significant improvements in patients with PD and in PD animal models. Studies using functional magnetic resonance imaging (fMRI) have shown that patients with PD, compared to healthy participants, have lower neural responses in extensive brain regions including the putamen, thalamus, and the supplementary motor area.

Amnesic syndrome in a mammillothalamic tract infarction.

It is controversial whether isolated lesions of mammillothalamic tract (MTT) produce significant amnesia. Since the MTT is small and adjacent to several important structures for memory, amnesia associated with isolated MTT infarction has been rarely reported. We report a patient who developed amnesia following an infarction of the left MTT that spared adjacent memory-related structures including the anterior thalamic nucleus. The patients memory deficit was characterized by a severe anterograde encoding deficit and retrograde amnesia with a temporal gradient. In contrast, he did not show either frontal executive dysfunction or personality change that is frequently recognized in the anterior or medial thalamic lesion. We postulate that an amnesic syndrome can develop following discrete lesions of the MTT.

Optical, spectral and thermal characteristics of GaN-based vertical light emitting diodes on graphite substrate

We investigated the optical, spectral and thermal characteristics of GaN-based blue vertical light emitting diodes (VLEDs) on graphite substrate in comparison with conventional lateral LEDs (LLEDs) on sapphire substrate with a mesa size of 1 × 1 mm2. For fabricated VLEDs and LLEDs, the temperature-dependent optical and spectral characteristics were measured in the temperature range of 288–378 K and the junction temperatures (Tj) were experimentally determined by the forward voltage method. From these results, the improved optical property and high thermal stability were achieved by the VLED structure on graphite substrate. At 350 mA, the optical output power of the VLED on graphite substrate was improved by 23% compared to the LLED on sapphire substrate at the temperature of 298 K. Also, the VLED on graphite substrate exhibited lower junction temperature and thermal resistance than those of the LLED on sapphire substrate.

PO5.26 Characteristics of the Proximal Lower Limb MRI in Korean Charcot-Marie-Tooth Patients with Demyelinating Neuropathy and Axonal Neuropathy

diagnostic criteria for demyelinated nerves were fulfilled in 5 (38%). Albuminocytologic dissociation of CSF in 6. No autoantibody was detected in all tested patients. Conclusions: Sensory symptoms of Ab and Ad fibers transmitting vibratory sense and sharp pain with symmetric centrifugal patterns of trunk and limbs, decreased SNAPs, absent H-reflex suggest pathology as demyelinating sensory polyneuropathy, not ganglionopathy. However, albuminocytologic dissociation, multiple combination of demyelinating NCS and minor weakness in most patients suggest sensory fiber myelinspecific disease, triggered by virus or bacteria, as superantigen, or by activation of primed CD4 T helperor memory-cell by molecular mimicrying antigen.