图示：转移至肝脏的恶性肿瘤
可见大量灰白色大小不等的肿瘤结节，然而原发瘤多为单发。转移是恶性肿瘤的一个重要特征。
This is an example of metastases to the liver. Note that the tan-white masses are multiple and irregularly sized. A primary neoplasm is more likely to be a solitary mass. Metastasis is the best indication that a neoplasm is malignant.