肾脏转移瘤与肾原发癌CT表现的对比研究

目的 探讨肾转移瘤的ＣＴ表现特点。方法 对比分析经手术病理证实的１１例肾转移瘤及１００例原发肾癌的ＣＴ资料。转移瘤来自肺癌者６例，食管癌２例，肾上腺皮质癌，睾丸精原细胞瘤和原发灶不明各１例。

CT findings of metastastic and primary neoplasms of the kidney: a comparative study

OBJECTIVE: To study CT findings of renal metastases and compare them with primary renal cell carcinoma. METHODS: CT features of eleven cases of renal metastases and one hundred cases of primary renal cell carcinoma confirmed by histopathology were studied and compared. The metastastic tumors arised from lung carcinoma in 6 cases, esophagus carcinoma in 2 cases and one in each of adrenal cortical carcinoma, testis seminoma and unknown primary tumor. RESULTS: Renal metastases accounted for 3.7% of all malignant tumors of the kidney. The ratio of renal metastases to second primary renal carcinoma was 1:1. On CT, the renal metastases appeared as diffusely invasive, ill-definded mass (63.6%), 18.2% of the neoplasms were multiple, without or less exophytic (81.8%) and without or with minimal enhancing on postcontrast scan (100%). The tumor invaded the pelvocalyceal system (72.7%). In contrast, the primary renal cell carcinomas were nodular, rounded or lobulated and more exophytic mass with well-defined border and regular contours (87.0%). Moderate to high enhancing postcontrast (80.7%) was observed with obvious necrosis (60.2%), foci of calcification (15.0%) and invasion of the renal vein and inferior vena cava (7.0%). CONCLUSION: Contrast-enhanced CT is helpful in the differential diagnosis of renal metastases from primary renal cell carcinoma. But for those showing single, more exophytic mass with well-defined border and intense enhancing postcontrast, the correct diagnosis depends on histopathology.