A proposed diagnostic algorithm from Yamamoto et al. [38] suggests three criteria to identify anti-Pit1-hypophysitis: acquired growth hormone, TSH, and prolactin deficiencies without impairment of other pituitary axes; presence of anti-PIT1 antibodies or PIT1-reactive cytotoxic T-lymphocytes; and an underlying diagnosis of thymoma or malignant neoplasm [5,37]. Here, GH1 is linked to thymoma.