ERCP procedure will be performed to visualize bile ducts.

For indeterminate strictures or undefined filling defects cases procedural success is defined as 1) ability to visualize stricture or defect, and 2) ability to provide visual impression of malignancy, and 3) when applicable, ability to obtain SpyBite biopsy adequate for histology

For biliary stone cases procedural success is defined as 1) ability to visualize the stone(s), and 2) ability to successfully initiate stone fragmentation, and 3) ability to achieve stone clearance in one or more SpyGlass procedures.

For other indications procedural success is defined as ability to establish diagnosis and /or complete therapy in the following categories: 1) pre-operative assessment of extent of peri-ampullary and biliary tumors, 2) selective guidewire placement, 3) assessment of unexplained hemobilia, 4) assessment of portal biliopathy, 5) assessment of intraductal biliary ablation therapy, 6) extraction of migrated stents, or 7) other.

Evaluation of serious adverse events (SAEs) related to the SpyGlass devices and/or the SpyGlass procedure from enrollment through the 72 Hour Post Procedure Follow-up Visit.