Post mortem lung with space-occupying lesions. Transverse CT-slice of the thorax of dog 9, at the level of the 7th thoracic vertebra. The gravity-dependent gradual increase in ground-glass opacity in the lung tissue reflects the passive distribution of air and blood after death. It is typical for the post mortem lung [26]. Space-occupying lesions are visible in the accessory and in the right middle lung lobe. For the latter lesion, atelectasis is an important differential to neoplasia