A tumor destroys the normal anatomy . always be on the lookout for displaced structures . it is better to say " there it is " and be wrong a hundred times than to say " there it was " and be right once 肿瘤会破坏正常解剖关系，要始终留意移位的结构。说错“它在这儿”一百次也比说对“它曾经在这儿”一次要好。
