Fig 1.

A 55-year-old man with type 1 BCA in the right parotid gland A, and B, CT shows a round, well-defined, homogeneously enhancing lesion in the superficial region of the right parotid superficial lobe. The lesion is adjacent to the outer border of the parotid gland (white arrow). C, The tumor shows as well-defined and homogeneously hypoechoic on sonography. D, and E. Photomicrographs of tumor specimen (hematoxylin-eosin stain; ×50 and ×100) show capillaries (black arrows) and uniform tumor cell without hemorrhage, collagen deposition, or cystic change.