[Prognostic value of initial ultrastructural changes in squamous cell metaplasia of junction cell papilloma of the bladder].

In 48 patients with a junction cell papilloma, in 65--with a junction cell and in 20--with nondifferentiated bladder cancer the electron-microscopic studying of the squamous cell metaplasia signs was conducted. Great prognostic importance of an early and overt signs of squamous cell metaplasia was established.