Methods
All patients aged below 18 years of age who underwent HSCT in HKCH and diagnosed to have TA-TMA during the 2-year study period from 1 April 2019 to 31 March 2021 were included. Data on basic demographics, transplant details, potential risk factors for pathogenesis of TA-TMA, clinical and laboratory presentations of TA-TMA, subsequent treatment and outcomes were collected.