转移性肾脏肿瘤。是双侧多发性不规则的肿块（有许多因中央坏死而呈中心凹陷或脐样，称癌脐）。肾脏不是肿瘤转移的常见部位。
The multiple irregular bilateral masses (many of which show central indentations, or "umbilications", from necrosis) here represent metastases of carcinoma to the kidneys. Kidney is not a usual site for metastases.
