[Severe self-limiting hypersensitivity reaction after immunotherapy with intravesical BCG].

We present the case of a 67-years-old patient diagnosed of superficial vesical transitional carcinoma which, under immunotherapy with intravesical BCG, developed a severe hypersensitivity reaction with spontaneous resolution. We describe several adverse reactions after the administration of intravesical BCG, as well as its diagnostic and therapeutic problems, especially in the cases of hypersensitivity.