[Radionecrosis of the optic chiasma. A clinical and radiological study of 3 cases].

The paper reports three cases of optic chiasmal radionecrosis due to radiotherapy of the sellar region. These three cases are compared with 34 ones found in literature. The use of M.R.I. is shown to dramatically improve diagnosis. Corticoids are useful in the treatment. The gravity of the complication, which implies visual prognosis, focuses on a strict use of radiotherapy. For benign or slowly evoluting lesions, surgery and/or regular controls by modern imaging techniques would often be more eligible than systematic earliest irradiation.