ArticleRespiratory medicine case reports2020
Collision tumors of the lung: A case report of urothelial carcinoma metastasizing to renal cell carcinoma with heterotopic ossification.
Article in Respiratory medicine case reports, 2020. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 3 papers.
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3 citing papers in PubMed, 5 citations in OpenAlex.
- Pulmonary Collision Tumor Comprising Lung Adenocarcinoma and Metastatic Endometrial Cancer: A Case Report.Thoracic cancer · 2026Article
- Concurrent papillary thyroid carcinoma and incidental cervical lymph node indolent B cell non-Hodgkin lymphoma: clinicopathological features, outcomes, and potential relationships.World journal of surgical oncology · 2025Article
- Collision carcinoma of the rectum involving neuroendocrine carcinoma and adenocarcinoma: A case report.World journal of clinical cases · 2021Article
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5 authors at 2 institutions in 1 country.
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Abstract
Collision tumors are rare entities that consist of at least two or more histologically and ontologically distinct tumor types within the same organ. It is still not well understood how collision tumors form; yet, three main theories have been proposed to explain the pathogenesis, including the "random collision effect," "field cancerization," and "tumor-to-tumor carcinogenesis." Collision tumors have been encountered in various body organs, including the lung. They either consist of a metastasizing tumor colliding with primary cancer or distinct primary or metastatic cancers colliding together. Here, we describe a rare case of collision tumors of the lung that consists of two metastatic carcinomas, namely renal cell carcinoma and urothelial carcinoma of the bladder. We propose that the urothelial carcinoma disseminated into several pre-existing pulmonary metastases of renal cell carcinoma with heterotopic bone formation. The possible mechanisms underlying the development of this peculiar tumor are discussed.
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