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Since the first case has emerged, different neurological complications associated with Coronavirus disease-2019 (COVID-19) have been reported all over the world. The association between coronavirus and Guillain-Barré syndrome (GBS) has also been reported before. Unfortunately, there is no certain mechanism about this association yet. Molecular mimicry is one of the first hypotheses to express the undesirable autoimmunity in GBS. According to this; the antibodies produced against virus may target peripheral nerves or spinal nerve roots. The entity of direct viral neurotoxicity has also been discussed. Here, we presented four variants of GBS associated with coronavirus that we followed up in our clinic between September-December 2020. While the first patient had demyelinating sensorimotor neuropathy concurrent with COVID-19, the other ones were postinfectious. The second patient had motor axonal neuropathy and the third one had sensorimotor axonal neuropathy. There was Miller-Fisher syndrome and GBS overlap in the fourth patient. [ABSTRACT FROM AUTHOR]

Objective: In this study, we aimed to compare the hippocampal volumes of patients diagnosed as Alzheimer's disease (AD) and mild cognitive impairment (MCI) and of healthy objects. We also tried to demonstrate whether there was a possible correlation between the cognitive tests and the hippocampal volumes. Materials and Methods: The mini mental state examination (MMSE), ADAS-Cog and Global Deterioration Scale (GDS) were administrated to the patients having AD (n= 20). MMSE and ADAS-Cog to MCI patients (n= 20) and the healthy control group (n= 18). Both right and left hippocampal volumes were measured by a three dimensioned Surf Driver programme with the support of cranial magnetic resonance imaging (MRI). Results: Both right and left hippocampal volumes of the AD group were significantly smaller than the MCI and the control groups. Bilateral hippocampal volumes of MCI group were also smaller than the control group (hippocampal volumes; AD < MCI < control groups). The differences between the right and the left hippocampal volumes were not significant in both AD or MCI groups. Conclusion: Surf Driver method successfully demonstrated the relative hippocampal atrophy in the AD and the MCI groups when compared with the healthy controls. [ABSTRACT FROM AUTHOR]