Crocidolite asbestos dust was inoculated intrapleurally in 36 rats. Chest radiographs were obtained up to 120 weeks after inoculation. Radiological and pathological observations were compared. In 3 animals, in which mesotheliomata were suspected radiologically, no evidence of malignancy was observed on histological examination. A radiological diagnosis suggesting probable or definite malignancy was made in all 7 animals with histologically proven mesotheliomata.
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