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Updated: Dec 20, 2025

Assessing Urinary Tract Junction Obstruction Defects by Methylene Blue Dye Injection
Published on: October 12, 2017
Severe ureteropelvic junction obstruction with massive hydronephrosis causing compression of the inferior vena cava
Kian Asanad1, Nima Nassiri1, Evalynn Vasquez1
1Children's Hospital of Los Angeles, Division of Pediatric Urology, Los Angeles, CA, USA.
Abstract:
A 7-week-old girl presented with tachypnea and abdominal distension. Abdominal ultrasonography demonstrated a 16 cm cystic mass in the right abdomen. Contrast-enhanced T2-weighted magnetic resonance imaging revealed severe hydronephrosis of the right kidney with thinning of the renal parenchyma consistent with a massive ureteropelvic junction (UPJ) obstruction. A percutaneous nephrostomy tube was placed for decompression of her right kidney and 1270 ml of fluid was drained. The patient underwent an open pyeloplasty. Her follow-up renal ultrasonography demonstrated resolution of her severe hydronephrosis.
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