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The authors assessed the regression of choroidal tumors, following irradiation treatment, by means of B scan sonography (Sonomed B 3000). Thirty-two patients were studied, 12 of whom underwent brachytherapy with 106 Ru plaques and 20 of whom were treated with accelerated protons. After a follow-up period of 12 months, the following was observed: reduction of the thickness of the tumor (significantly greater in the tumors which underwent brachytherapy) and morphological and structural changes which consisted in a thinning of the tumor and an increased reflectivity.