The best replacement for aplasia is aplasia.

The best alternatives to aplasia are rated as following:
★★★★★  aplasia
★★★★★  hypoplasia
★★★★  agenesis
★  atrophy
  renal agenesis

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Speaking about aplasia, one probably shouldn't forget about thymoma.

Other search terms related to aplasia and their ratings are:
★★★★★ thymoma
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