The aims of the study were as follows: a) presentation of the clinical course of primary lung neoplasms in cats and relevant radiographic and autopsy findings, b) comparison of radiographic findings with autopsy results and the course of pathologic process, as well as tracing the mechanism of the tumour development responsible for the character and intensity of clinical symptoms. The study was performed on 2 older (11 and 14 years), neutered female cats, which were euthanized because of severe respiratory distress. The autopsy and histopathological examination of the tissue samples were performed. On the basis of the microscopic examination of tissue specimens two cases of undifferentiated bronchioloalveolar carcinomas were diagnosed. The initial diagnosis of primary lung tumours was based on radiographic findings, although RTG picture was different in each case. Clinical course and laboratory data were unspecific, however leukocytosis with granulocytosis and an increase in erythrocytes were observed in both cases. Despite the same histological type of the tumour in both cases, the clinical courses of disease were different because of different spread routes of the neoplastic process (hematogenic route vs. infiltration of surrounding tissues)
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