Tumour blood vessel. Coloured scanning electron micrograph (SEM) of a section of tissue from a tumour to show the blood supply from a sarcoma. A small blood vessel has been fractured releasing numerous red blood cells. Yellow connective tissue surrounds the vessel. One of the reasons tumours can grow quickly is because they trigger the formation of new blood vessels to bring blood to the tumour. This image is from an alveolar soft part sarcoma, or ASPS, a cancer that can come from different types of soft tissue, such as muscle, fat, or nerves. It may also be called alveolar soft tissue sarcoma, alveolar sarcoma of soft parts, or ASP sarcoma. Magnification: x1500 when printed 10cm wide.