Upon questioning, he admitted to having a peculiar habit of chewing every bit of chicken, including the bones. This is consistent with bezoar.
A bezoar is a mass found trapped in the gastrointestinal system (usually the stomach)]though it can occur in other locations. There are several varieties of bezoar, some of which have inorganic constituents and others organic. Most of the time, it collects in the stomach and fails to pass through the intestines. Surgery may be needed.