An extensive arterial thrombosis with lower limb ischemia in a COVID-19 patient: a case report.Johary Andriamamonjisoa Andriamizanaka1, Etienne Rakotomijoro2, Volatiana Andriananja3, Mihaja Raberahona4, Radonirina Lazasoa Andrianasolo5, Rivonirina Andry Rakotoarivelo6, Jean de Dieu Randria Mamy7