Interstitial cystitis is a clinical entity that has been known for a centur
y, but its pathophysiology remains largely unknown and the optimal treatmen
t is a matter of ongoing discussion. A successful strategy for treatment re
lies on precise appraisal of symptoms, clinical findings and histology, as
well as on the patient's individual personality. The least invasive treatme
nt possible should be chosen, and only after conservative options have been
exhausted should a surgical solution be considered. In this respect, anato
mical bladder capacity plays an important role. A large capacity indicates
the potential for conservative treatment and may be regarded as a negative
predictor for the outcome of orthotopic bladder substitution. In contrast,
a small anatomical capacity is unlikely to respond to conservative therapy,
but is associated with a high probability of successful orthotopic bladder
substitution.