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An ovine pulmonary tumour of alveolar epithelial Type II cells.

A small tumour was found at the periphery of the lung during routine necropsy of a 13-year-old Romney ewe. The tumour consisted of vacuolated, cuboidal cells which lined alveolar spaces without destroying them. Electron microscopy revealed numerous microvilli on the free surface of the cells and irregularly shaped osmiophilic inclusions within the vacuoles. No viral particles were found and the tumour was diagnosed as a well differentiated Type II pneumocyte adenocarcinoma of unknown aetiology.