What is the role of partial androgen insensitivity syndrome in the etiology of microphallus?

Updated: Nov 30, 2020
  • Author: Karen S Vogt, MD; Chief Editor: Sasigarn A Bowden, MD  more...
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PAIS is caused by a defect in the androgen receptor. Isolated micropenis is not typically a manifestation of PAIS because the genitalia are usually more ambiguous. Gonadotropin and testosterone levels are elevated in this condition. Because the gene that codes for the androgen receptor is located on the X chromosome, PAIS is inherited in an X-linked manner. [11]

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