constitute the majority (80%) of gallstones found at operation.
Both 1 and 2 are Mixed stones
Pigment stones (calcium bilirubinate) ;
multiple, they become faceted by mutual pressure or by friction one
against the other.
Dozens or hundreds of
such stones are often present, frequently the gallbladder being
packed to capacity.
On section each is
found to be laminated.
The central nucleus
may contain epithelial debris and bacteria, which suggests that the
cause in that particular case is inflammatory.
composition of the central core, alternating layers of cholesterol
and calcium carbonate and/or calcium bilirubinate are deposited upon