Fig. 4

Light microscopy (200×) demonstrated that the tumour cells grew in irregular cords or plates separated by dilated sinusoidal vessels (trabecular pattern) or focally formed acinar or pseudoglandular structures. Dilated bile canaliculi with condensed bile in the lumina were present. The tumour cells showed cytologic atypia and had abundant pale cytoplasm, large hyperchromatic nuclei, and identifiable nucleoli (400× insert)