The authors illustrate through the observation of an aggressive and exceptional pleural evolution metastatic of a carcinoma urothélial of the upper urinary tract at the source of an atypical and rarely described chest ray aspect of pseudo-mesothelioma. In our case, the instillation with the BCG Pasteur by the percutaneous nephrostomy and the pleurX in favor of a heavy chemotherapy have enabled us to circumvent the evolution towards the acute complications related to this pathology, the malignant pleuresis.