[Spontaneous sigmoido-vesical fistula].

The colo-vesical fistula, most frequently of diverticular origin, usually occurs at a later age, when the diverticular disease is complicated by local and peri-sigmoidal processes. A characteristic of this disturbance is the fact that, although the causal affection is colical, the manifestation, at least initially, is mostly at the level of the urinary bladder, under the form of repeated bouts of cystitis of an apparently undetermined origin. Such manifestations should prompt, besides exploration of the urinary apparatus, also an exploration of the colon.