This is an illustration of pulmonary thromboembolism and economy class syndrome (man). Pulmonary thromboembolism is a disease that occurs when the lower limbs are compressed in the same position for a long time, and blood flow deteriorates, making it easier to create blood clots, causing the blood clot to clyle the veins of the lungs. This man has been on the plane in the same position for a long time and looks like his legs are swollen.
