The atrophy is due to the increased circulating level of sex hormones, and chemical or physical castration of an adult results in the thymus increasing in size and activity. Severe illness or human immunodeficiency virus infection may also result in involution.
The atrophy is due to the increased circulating level of sex hormones and chemical or physical castration of an adult results in the thymus increasing in size and activity Severe illness or human immunodeficiency virus infection may also result in involution