A case of a gallbladder elevated hyperplastic lesion associated with pancreaticobiliary maljunction

Abstract

A 47-year-old woman underwent further examination of her dilated common bile duct, which was detected during medical checkup. Contrast-enhanced CT detected a weakly enhanced 10-mm gallbladder polyp. The apparent diffusion coefficient value on diffusion-weighted MRI for the polyp was 2.41×10^-3 mm²/sec. EUS revealed pancreaticobiliary maljunction and an 18-mm isoechogenic gallbladder polyp. On contrast-enhanced EUS, the polyp was heterogeneous at peak-time enhancement, and washout of the contrast agent was observed at about 130 seconds after administration. These findings are mostly consistent with a benign gallbladder polyp. The patient underwent a cholecystectomy combined with the extrahepatic bile duct resection. Histopathological examination revealed that the lesion was confirmed as a pyloric-type hyperplastic lesion.