title: [Tumor-to-tumor metastasis: report of three cases].
abstract: Tumor-to-tumor metastasis is a very rare event. We report three cases of tumor metastasizing in another tumor: a clear cell renal cell carcinoma in a vesicular thyroid adenoma, a lung carcinoma in a meningioma and a neuroendocrine lung carcinoma in a clear cell renal cell carcinoma. According to the literature, clear cell renal cell carcinoma is the most common tumor recipient of metastasis while lung carcinoma is the most common donor tumor. Several physiopathological mechanisms can explain this phenomenon, but many of them are still unknown.
authors.affiliation: Service d'anatomie et de cytologie pathologiques, hôpital de la Source, BP 6709, 45067 Orléans cedex 2, France. raphaelle.duprez@wanadoo.fr
authors.forename: Raphaëlle
authors.initials: R
authors.lastname: Duprez
authors.forename: Sylvie
authors.initials: S
authors.lastname: Thimon
authors.forename: Rémy
authors.initials: R
authors.lastname: Kerdraon
authors.forename: Carole
authors.initials: C
authors.lastname: Bonneau
authors.forename: David
authors.initials: D
authors.lastname: Metois
authors.forename: Patrick
authors.initials: P
authors.lastname: Michenet
mesh_terms: D018262:Adenocarcinoma, Clear Cell / Q000473:pathology; D000368:Aged; D001706:Biopsy; D018287:Carcinoma, Large Cell / Q000473:pathology; D002455:Cell Division; D005260:Female; D006469:Hemoptysis / Q000473:pathology; D006801:Humans; D007150:Immunohistochemistry; D007633:Keratins / Q000032:analysis; D007680:Kidney Neoplasms / Q000473:pathology*; D008175:Lung Neoplasms / Q000473:pathology*; D008297:Male; D008577:Meningeal Neoplasms / Q000473:pathology*; D008579:Meningioma / Q000473:pathology*; D008875:Middle Aged; D009362:Neoplasm Metastasis / Q000473:pathology*; D009392:Nephrectomy; D013964:Thyroid Neoplasms / Q000473:pathology*
chemical_list: D007633:Keratins