Thorotrast-induced renal tumours after retrograde pyelogram

Area of Science:

• Nephrology
• Urology
• Radiology
• Oncology

Background:

• Thorotrast, a formerly used radiographic contrast agent, has been linked to long-term adverse effects.
• Retrograde pyelogram with reflux is a diagnostic procedure that can lead to contrast material deposition in the renal parenchyma.
• Thorotrast deposition in the kidneys, termed 'thorotrast kidney,' poses a potential health risk.

Observation:

• Seven cases of 'thorotrast kidney' were analyzed following retrograde pyelogram with reflux.
• Five patients developed kidney cancer, with four diagnosed with renal pelvic carcinoma.
• Cancer diagnosis occurred 14 to 41 years post-Thorotrast pyelogram.

Findings:

• A significant association exists between Thorotrast deposition and renal pelvic carcinoma.
• Misinterpretation of contrast deposits and inadequate follow-up were noted in some cases.
• The latency period for Thorotrast-induced renal malignancy can be decades.

Implications:

• 'Thorotrast kidneys' present a high risk for malignancy, necessitating vigilant monitoring.
• Intravenous pyelogram and exfoliative cytology are recommended for follow-up surveillance.
• Nephro-ureterectomy should be deferred if follow-up tests are negative, optimizing patient care.