A, CD45 immunostaining infiltration score in pituitary adenomas (n = 72), normal pituitary at autopsy (n = 12), and autoimmune hypophysitis (n = 14). Pituitary adenoma CD45 immunostaining infiltration scores 1 (B), score 2 (C), score 3 (D), normal pituitary at autopsy score 0 (E), and autoimmune hypophysitis score 5 (F) are shown.