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Related Experiment Video

Updated: Sep 3, 2025

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Renal collision tumours: three additional case reports.

Valère Belle Mbou1, Florian Sanglier2, Julia Pestre-Munier3

  • 1Service d'Anatomie pathologique, CHU de Limoges, 2 avenue Martin Luther King Limoges cedex, 87042, Limoges, France. valere.bellembou@chu-limoges.fr.

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Renal collision tumours (RCT) are rare kidney lesions with distinct subtypes. This study presents three successful nephrectomy cases, highlighting the need for further research into their origins and management strategies.

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Area of Science:

  • Oncology
  • Nephrology
  • Pathology

Background:

  • Renal collision tumours (RCT) are uncommon histological entities characterized by multiple, unrelated tumour types within the same kidney location.
  • Common subtypes include clear cell renal cell carcinoma (CCRCC), papillary renal cell carcinoma (PRCC), chromophobe renal cell carcinoma (CRCC), and collecting duct carcinoma (CDC).

Observation:

  • This report details three sporadic cases of RCT successfully treated with nephrectomy and confirmed via histological analysis.
  • Case 1: A 64-year-old male with CCRCC (grade 3) and PRCC (grade 2).
  • Case 2: A 68-year-old female with PRCC (grade 2) and angiomyolipoma.
  • Case 3: A 59-year-old female with CCRCC (grade 3) and collecting duct carcinoma (grade 1b).

Findings:

  • Prognosis of RCT is influenced by the most aggressive tumour component, often correlating with higher nucleolar grade and stage.
  • The histogenesis of RCT remains an area of ongoing debate and research.

Implications:

  • The rarity of RCT necessitates further investigation to establish standardized management guidelines.
  • Increased understanding of RCT histogenesis may facilitate the development of targeted therapies for advanced or metastatic disease.