Fig. 3

Male patient with recent chest drainage catheter insertion. a A CT examination showed focal heterogenous density (arrow) within a pleural effusion, thought to be a haematoma secondary to the drainage catheter insertion (thin arrow). b B mode ultrasound of the lesion (arrow) is of a predominantly solid appearance. c CEUS defines the large avascular necrotic central component (arrowhead) and a thick enhancing periphery (arrow), indicating that the biopsy had to be taken from the periphery. Histology revealed sarcomatoid mesothelioma