Fig. 2From: Tumor-to-tumor metastasis: a rare case of breast carcinoma metastasizing to a pheochromocytoma, and a literature reviewUltrasound image showing a hypoechoic mass with a clear boundary in the right adrenal gland. The internal echo is heterogeneous (a). Color Doppler flow image showing a rich blood flow signal inside this mass (b)Back to article page