Lai Gi-ming notes that a tumor must be at least one centimeter in size to be detected by a chest X-ray, and the tumor may unfortunately be hidden from view by the heart or ribs.
賴基銘指出，腫瘤要一公分以上，胸部 X 光才看得到，如果運氣不好，腫瘤長在被心臟、肋骨擋住的位置，也很難被發現。