Renal papillary necrosis with urinary tract obstruction: A case report

Figure 1 Orange arrows showed the right distal ureteric lesions.

Figure 2 Computed tomography urography. A: In axial plane, two orange arrows showed non enhancing filling defects in the upper ureter and calyces of the right kidney; B: In coronal plane, two yellow arrows showed non enhancing filling defects in the upper ureter and calyces of the right kidney.

Figure 3 The endoscopic sign of renal papillary necrosis. A: Black arrows showed the part of this renal papilla undergoing selective necrosis, which was sloughing with pedicles inside the calyces; B: White arrows showed the necrotic papilla floating as cottons in the calyces, which were characterized by whitish structures, soft and friable.

Figure 4 Histopathological findings, fragments consisting of necrotic material. Infarcted renal papilla was accompanied with inflammatory exudations. No malignancy was identified. A: HE stain, 20 ×; B: HE stain, 40 ×.