Sonomorphology of a squamous cell carcinoma with predominantly endobronchial growth in a flooded human lung lobe. ( a ) Computed tomography scan of tumour localised to the centre of the right inferior pulmonary lobe. There is no evidence of bronchial wall destruction. ( b ) Macroscopic specimen with incised inferior lobar bronchus (after flooding). ( c ) Sonogram shows an inhomogeneous tumour with predominantly endobronchial growth, causing destruction of the bronchial wall (arrow). The normal bronchial wall clearly shows a three-layered structure (two arrows).