We present the case of a 45-yr-old female patient with a 23 yr history
of interstitial cystitis that multiple surgical procedures, including
a ceco-cystoplasty, were unable to cure. After a cystectomy was perfo
rmed, histological examination of the bladder showed the development o
f collagenous colitis. Although the etiology oi both interstitial cyst
itis and collagenous colitis is unknown, this report postulates an ass
ociation between these two conditions.