Endoluminal Forceps Biopsy of the Urotract Disease Through a Percutaneous Nephrostomy Tract

Articles of sonography or CT-guided percutaneous needle biopsy of the different renal parenchymal disease have been published in the literatures. However, tissue confirmation of the urotract lesion is difficult to be obtained by the percutaneous approach because most of the lesions are small and no definite mass could be demonstrated on imaging studies. Percutaneous nephrostomy is a standard procedure in cases of obstructive uropathy in order to alleviate the obstruction, most of which are secondary to calculi. In some equivocal cases in which the cause of obstruction cannot be definitely determined and a tumor is highly suspected, histopathologic diagnosis is essential for proper therapeutic planning. To obtain a definite tissue diagnosis, we performed transluminal forceps biopsy through a percutaneous nephrostomy tract in nine patients with obstructive uropathy.