Genito-urinary tuberculosis is the most common manifestation of extrapulmonary tuberculosis. Classic findings of renal tuberculosis on computed tomography (CT) urography include calcifications, deformation of calyces, obstructive hydronephrosis or hydrocalyx, and medullary and papillary necrosis. The different macroscopic patterns of renal tuberculosis on CT urography include: the open form, with extension of the caseified necrosis to the intra-renal excretory tract; the closed form, with extension of necrosis toward the renal parenchyma with progressive tissue scarring; and putty kidney.
