Histological changes at an endosonography-guided biliary drainage site: A case report

Figure 4 Microscopic views of the sinus tract. Mild inflammatory cell infiltrate adjacent to the sinus tract in the duodenal wall and the bile duct wall is seen, without hemorrhage or abscess formation. A fistula is formed along the tract of the puncture but without significant reactive changes. A: Low-power view of the sinus tract (× 1.25); B: End of the sinus tract on the bile duct side (× 5); C: End of the sinus tract on the duodenal side (× 5).