ABSTRACT
Bladder diverticulum, a herniation of the bladder mucosa, occurs through a weak point of a hypertrophied muscular wall caused by bladder outlet obstruction. Bladder diverticula can be congenital but, more frequently, are acquired. The diverticulum wall includes an inner mucosal layer and an outer fibrous reactive layer. In 1922 Geraghty demonstrated that removing the mucosal layer was sufficient to obliterate the cavity delimited by the fibrous layer.
