Tā bèi zhěnduàn wéi zhòngxíng zàishēng zhàng'àixìng pínxuè.
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 (zàizhàng) in clinical shorthand.