645: SEVERE SICKLE CELL CRISIS COMPLICATED BY THROMBOTIC THROMBOCYTOPENIC PURPURA. (16th December 2021) - Goldenberg, David; Wasanwala, Huzaifa; Stokes, Michael; Agrawal, Avni; Erickson, Stephanie; Lessans, Spencer; Snyder, Samantha; Hernandez, Christian; Ruiz, Arnaldo Lopez