Tā bèi zhěnduàn wéi zhòngxíng zàishēngzhàng'àixìngpínxuè.
She was diagnosed with severe aplastic anemia.
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Parses as 再生 (regeneration) + 障碍 (obstruction) + 性 (-type) + 贫血 (anemia) = 'regeneration-obstruction-type anemia' - the bone marrow fails to regenerate blood cells. Often shortened to 再障 in clinical shorthand.