A diverticulum (plural: diverticula) is medical or biological term for an outpouching of a hollow (or a fluid filled) structure in the body. In medicine the term usually implies that the structure isn't normally present, for example, pathological. However, in the embryonic stage, some normal structures begin development as a diverticulum arising from another structure. An alphabetical listing of some frequently encountered diverticula follows: PathologicalBladder diverticulum: Balloon-like gro… (More on Diverticulum)