Neurological symptoms might be associated with a Covid-19 infection. There are frequent reports in the last weeks. The neurological symptoms range from harmless side effects of a viral infection to meningoencephalitis and acute haemorrhagic necrotizing encephalopathy. Our patient reported burning headache and paresthesia as the initial symptoms mainly without other signs of viral infection like cough or fever. Such an initial neurological presentation seems to be rare. Most cases have neurological symptoms which can be expected after severe systemic viral infections like fever associated headache. Many COVID-19 patients with mild disease are at home and the further course is unknown. Our case shows, that neurological symptoms can be the first manifestation of an COVID-19 disease. While restricted paraesthesia has been reported in SARS-CoV-2 infections, hemisymptoms have not been described as initial symptoms.

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Crystal structures and magnetic and thermal properties of neodymium ruthenate Nd 3 RuO 7 have been investigated. The specific heat and neutron diffraction measurements showed a monoclinic-orthorhombic structural phase transition at 130 K. The monoclinic crystal structure at 100 K is well described with the space group P2 1 /m (a = 10.8893(4) Å, b = 7.3864(2) Å, c = 7.4731(2) Å and β = 90.008(6) • ). The results of the magnetic susceptibility measurements show the existence of the antiferromagnetic transition with a weak ferromagnetic component at 19 K. Specific heat and neutron diffraction measurements also indicated long-range magnetic ordering of both Nd 3+ and Ru 5+ ions below 19 K. The magnetic sublattice of Nd 3+ ions was twice as large as the size of the crystal lattice along the b-axis. On the other hand, the size of the magnetic sublattice of Ru 5+ was the same as that of the crystal lattice. Ru 5+ ions were coupled anti-ferromagnetically along the c-axis.

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