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[Contribution to the scintigraphic diagnosis of malignant endothoracic tumors by 57Co labeled Bleomycin (author's transl)].

The authors report the results of the exploration by 57Co Bleomycin scinitigraphy in 97 thoracic tumors. The Bleo-57Co scintigraphy detects primary and secondary malignant tumors underevaluated by classical tests. In the thorax, the radioactive focus are easily detected on account of the light physiological fixation of the Bleo-57Co. It is particularly interesting in the mediastinal tumors where the picture is not covered by cardiovascular interference. Mediastinal, pleural and costal tumors have been explored. Pulmonary tumors give the best results, they fixe in 93% of the case. All the mediastinal tumors have capted the bleomycin but the authors insist on the fact that the fixation was very light even when the tumor was a large one. The exploration of pleural and costal tumors was less interesting. In conclusion, the Bleo-57Co scintigraphy, gives indications about the volume of the tumor and its spread in the organism. By this method, we can diagnose malignancy in tumor. It can be used to survey cancer patients which have been treated. Nevertheless the long half-life (270 days) and the lack of specificity of the Bleo-57Co for the malignant tumors, justify discussion about indications and the results of such an exploration.