case_images: PMC6398077_01
case_images: Initial imaging studies. Left: renal ultrasound at presentation revealed moderately enlarged kidneys with increased renal cortical echogenicity and mild bilateral hydronephrosis. Right: abdomen and pelvis computed tomogram without contrast revealed mild inflammatory changes without lymphadenopathy.
case_images: CRIN2019-2591560.001.jpg
case_images: PMC6398077_01_CRIN2019-2591560.001.jpg
case_images: fig1
case_images: Renal ultrasound and abdomen/pelvis CT without contrast revealed mild bilateral hydroureteronephrosis with nonspecific inflammatory changes (Figure 1).
case_images: Abdomen and pelvis computed tomogram with intravenous contrast revealed mild bilateral hydroureteronephrosis with point of obstruction at the level of distal abdominal aorta and inferior vena cava. There was an ill-defined, infiltrative soft tissue mass encasing both aorta and IVC (approximately 7.2 cm). The mass appeared to infiltrate along the bilateral proximal common iliac vessels.
case_images: CRIN2019-2591560.002.jpg
case_images: PMC6398077_01_CRIN2019-2591560.002.jpg
case_images: fig2
case_images: The mass appeared to infiltrate along the bilateral proximal common iliac vessels (Figure 2).
case_images: Follow-up abdomen and pelvis computed tomogram with and without intravenous contrast 4 months following a course of corticosteroid therapy revealed significant reduction in the soft tissue mass (approximately 4 cm in diameter compared with 7 cm at presentation).
case_images: CRIN2019-2591560.003.jpg
case_images: PMC6398077_01_CRIN2019-2591560.003.jpg
case_images: fig3
case_images: At 4-month follow-up, kidney function normalized and CT revealed marked reduction in RPF size (Figure 3).