患者男，56岁。9个月前体检B超发现右肾下极占位性病变，无血尿、高血压及肥胖等表现。因未怀疑肾上腺的病变，故未做有关的生化检查。CT扫描：右肾下极外分见一突出于肾轮廓之外的肿块，大小约2．7cm×3．1cm，平扫与肾脏等密度．CT值23HU（图1），增强后肿块边缘呈环状强化， Male patient, 56 years old. 9 months before the physical examination of B-discovery of the right kidney under the occupying lesions, no hematuria, high blood pressure and obesity and other performance. Because no adrenal lesions were suspected, no biochemical tests were performed. CT scan: The right kidney showed a mass out of the renal outline outside the lower pole, about 2.7cm × 3.1cm, plain scan and kidney density. The CT value was 23 HU (Figure 1). After the enhancement, the edge of the tumor was annularly reinforced.