送交者: 匆匆过客 于 2006-4-03, 15:58:29:
回答: 请扫盲 由 笑笑 于 2006-4-03, 15:50:31:
As matter of fact, cancer tumors look bright on ct images since they have more blood vessals in them.
Tumor cells are normal cells turn bad, meaning they don't die. They keep splitting and in order for new cells to grow, more nutritions are needed, thus more blood vessals etc.