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A thymectomy is a procedure for removing the thymus gland. “As many as 15% of MG patients have a tumor in the thymus, called a thymoma, and another 60–75% have abnormal enlargement of this gland” https://forumsstg.myastheniagravisnews.com/thymectomy/. I believe you are asking if thymomas are hereditary. Thymomas can also be an isolated condition not associated with MG. There is insufficient scientific evidence to support a genetic link to thymomas. Some studies suggest MG could be hereditary, https://forumsstg.myastheniagravisnews.com/news/possible-mg-genetic-component-found-in-large-scale-analysis-north-america/. I have come across several members within MG forums that have other family members with MG, both immediate and extended relations. However, this is an improbable occurrence.
– Jodi, Team Member