The World Health Organization/International Society of Urological Pathology consensus classification of urothelial (transitional cell) neoplasms of the urinary bladder

1998 
In October 1997, Dr. F.K. Mostofi assembled a group of individuals interested in bladder neoplasia at a meeting in Washington DC. The participants included urologic pathologists, urologists, urologic oncologists, and basic scientists with an interest in bladder neoplasia. The purpose of this meeting was to discuss bladder terminology and make recommendations to the World Health Organization (WHO) Committee on urothelial tumors. Following this meeting, a group of the urologic pathologists who attended the Washington meeting decided to broaden the representation of the group and arranged a meeting primarily of the members of the International Society of Urologic Pathologists (ISUP) at the 1998 United States and Canadian Academy of Pathology Meeting held in Boston. Massachusetts. At this meeting. issues regarding terminology of bladder lesions, primarily neoplastic and putative preneoplastic lesions, were discussed, resulting in a consensus statement. The WHO/ ISUP consensus classification arises from this consensus conference committee's recommendations to the WHO planning committee and their agreement with virtually all of the proposals presented herein. 29 The effort involved in reaching such a consensus was often considerable. Many of those involved in this process have compromised to arrive at a consensus. The aim was to develop a universally acceptable classification system for bladder neoplasia that could be used effectively by pathologists, urologists, and oncologists.
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