Abstract
Among a variety of induced pulmonary tumours, cystic squamous cell carcinomas were observed in five Syrian hamsters that inhaled a mixture of pyrolized tar pitch with coal oven flue exhaust (PCE) and additionally received intratracheal injections of benzo(a)pyrene. The histological appearance of these particular tumours is described, compared to similar tumour types in rats and the susceptibility of both species to inert particles is discussed.
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