The best replacement for agenesis is dysgenesis of the corpus callosum.

The best alternatives to agenesis are rated as following:
★★★★★  dysgenesis of the corpus callosum
★★★★★  aplasia
★★★★  hypoplasia
★★★  atresia
★★  androgen insensitivity

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Speaking about agenesis, one probably shouldn't forget about ureterocele.

Other search terms related to agenesis and their ratings are:
★★★★★ ureterocele
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agenesis
dysgenesis of the corpus callosum
aplasia