Radiological and pathological data of the case after chemotherapy. A. The mass decreased and was limited to the gallbladder fossa with clear margin. B. Small round-shaped tumor cells in gallbladder wall with marked interstitial fibrosis (HE×200). C. Positive expression of CgA in the cytoplasma of the tumor cells (IHC×200). D. Scattered large and cribriform glands infiltrate the mucous and muscularis layers (HE×200).