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Dr Ganty,
Thank you for your interest in our article. We are excited about the potential of stem cells and look forward to much more high-quality, ethics-approved research. Our patient has no ongoing follow-up with Lima and colleagues; because he had no point of contact, we did not inform them of this complication.
As outlined in the article, we believe this to be the fourth case of mass lesion following olfactory mucosal autograft. Dlouhy and colleagues describe the same complication in another patient who underwent treatment in Portugal (see reference 10). After their case report was published, Lima's colleagues wrote a letter to the editor of the Journal of Neurosurgery Spine acknowledging this complication (see "Autograft-derived spinal cord mass," volume 24, April 2016, pages 673-4; reference 3, appendix 1, of our article). We understand that this group is no longer offering this procedure.
Thank you again for your interest.