Abstract
Summary
1. Pituitary tumors do not form after radiothyroidectomy of C57 mice by small amounts of I131. 2. Pituitary tumors result when such radiothyroidectomy is followed by whole-body x-irradiation, or by larger amounts of I131. 3. Similar doses of x-rays alone do not lead to growth of the tumors. It appears that ionizing radiation induces these atypical growths in pituitaries physiologically altered by radiothyroidectomy.
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