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Fig 1. A 82-year-old man with basal cell adenoma (BCA) (membranous type, marked enhancement)
A, A T1-weighted image (T1WI) shows a homogeneously low-SI mass with a well-defined, smooth margin in the superficial lobe of the left parotid gland.
B, On T2WI, the tumor shows slightly lower SI than the normal parotid gland.
C, On Gd-enhanced fat-suppressed T1WI, the tumor shows homogeneous and strong enhancement.
D, On dynamic study, the tumor shows a rapid and prolonged enhancement pattern.
E, Microscopic examination (hematoxylin-eosin stain [H&E]) shows conspicuous hyaline matrix surrounding epithelial cells. Relatively large vessels are seen in the tumor (arrows).
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