Giant hepatobiliary cystadenoma in a male with obvious convex papillate

Figure 1 Transverse CT scan (A) showing a combined multiple low-density area and contrast CT showing enhanced septum (B) and convex papillate (C) of the tumor.

Figure 2 Magnetic resonance imaging showing a low intensity area on T1WI (A), and a medium-high intensity signal area on T2WI (B) as a multilocular cystic lesion with convex papillate.

Figure 3 A large cystic hepatobiliary cystadenoma in the left hepatic lobe (A) and a multilocular hepatobiliary cystadenoma with papillary projections (B) observed during and after operation.

Figure 4 Locules were lined by simple columnar-to-cuboidal epithelium with no nuclear atypia (HE, × 100) (A), and CK7 strongly and diffusely stained cystadenomas (immunostaining, × 400) (B). Similar results were also observed with CK8, CK18 and CK19 staining.