Limitations of exome sequencing:

Mutations located outside the exome.
Diseases located in the exome, but whose type of genetic variation is not identifiable by sequencing.
Diseases located in the exome, monogenetic, identifiable by Sanger sequencing, but that present technical challenges as a result of shotgun sequencing:
Diseases located in the exome, monogenetic, identifiable by Sanger sequencing, but that present technical challenges as a result of PCR amplification processes:
Other limitations: