ESSIC uses the name bladder pain syndrome (BPS) instead of interstitial cystitis (IC) and/or painful bladder syndrome (PBS): 
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Urothelial bladder carcinoma in situ involving the whole urinary tract. One case [Article in French]  

Bellocq JP, Lassabe-Roth C, Viville C, et al. J Urol (Paris) 1982;88:255-60  

  • the authors emphasize the difficulties of the pathological diagnosis on biopsy samples and relate the usual behaviour of carcinoma in situ who may often simulate an interstitial cystitis

CONFUSABLE DISEASES - Carcinoma in situ