[Intravesical Gemcitabine instillations following BCG failure and allergy to Mitomycin: A unique case of a patient with an inverted papilloma of the bladder]. / Intravesikale Gemcitabin-Instillationstherapie bei BCG-Versagen und Mitomycin-Allergie ­ Der besondere Fall einer Patientin mit invertiertem Papillom der Harnblase.

Intravesical chemotherapy instillation is a unique method of treatment confined to urothelial neoplasia. Within the last decades, the substances Bacillus Calmette-Guerin (BCG) and mitomycin C (MMC) have evolved as the standard regimens for intravesical therapy. However, there are other chemotherapeutic substances, which are used less frequently, such as gemcitabine. In this article we aim to highlight the clinical relevance of intravesical gemcitabine instillations as treatment of non-muscle invasive bladder cancer.The histological subtypes of bladder tumours are as diverse as the intravesical regimens. Inverted papilloma is a rare entity in the spectrum of urological diseases. There seems to be an association with non-muscle invasive bladder cancer.We report a rare case of an inverted bladder papilloma treated with intravesical gemcitabine instillations after BCG failure and an allergic reaction to MMC.