Tiny balconies of a Japanese tower block are just visible in the background of this image. This is overlain with a close-up photo of a porcelain design showing a spiral terminating in a large clump in the centre of the image. It symbolises the transit of a thrombus through the blood vessels till it impacts in the capillaries of the lung.
The X-ray is of a man with a pulmonary embolus after a long-haul aeroplane flight to Japan. Blood supply to a segment of the right lung is obstructed by a thrombus producing a small triangular opacity known as Hampton’s hump. This radiological sign is rare, and subject to interpersonal interpretation so is not very reliable.