title: A collision tumor of esophagus.
abstract: The collision tumor is defined by Meyer as that arisen from the accidental meeting and eventual intermingling of two independent neoplasms, which is quite rare. Most of them occur in the junction of different epithelial types of tissue such as oral cavity, esophagogastric junction, anorectaljunction and cervix, while collision tumors occurring in the liver, gallbladder, pancreatic, urinary bladder also have been reported. Here we present a case of 55-year-old Chinese man diagnosed as a collision tumor composed of leiomyosarcoma and squamous cell carcinoma (SqCC) in the lower third part of esophagus with 6 years survival after surgery and radiotherapy.
authors.affiliation: Department of Radiation Oncology, Qilu Hospital, Shandong University 107 West Wenhua Road, Jinan 250012, People's Republic of China.
authors.forename: Bin
authors.initials: B
authors.lastname: Yao
authors.affiliation: Department of Radiation Oncology, Qilu Hospital, Shandong University 107 West Wenhua Road, Jinan 250012, People's Republic of China.
authors.forename: Shanghui
authors.initials: S
authors.lastname: Guan
authors.affiliation: Department of Radiation Oncology, Qilu Hospital, Shandong University 107 West Wenhua Road, Jinan 250012, People's Republic of China.
authors.forename: Xiaochen
authors.initials: X
authors.lastname: Huang
authors.affiliation: Department of Radiation Oncology, Qilu Hospital, Shandong University 107 West Wenhua Road, Jinan 250012, People's Republic of China.
authors.forename: Peng
authors.initials: P
authors.lastname: Su
authors.affiliation: Department of Radiation Oncology, Qilu Hospital, Shandong University 107 West Wenhua Road, Jinan 250012, People's Republic of China.
authors.forename: Qingxu
authors.initials: Q
authors.lastname: Song
authors.affiliation: Department of Radiation Oncology, Qilu Hospital, Shandong University 107 West Wenhua Road, Jinan 250012, People's Republic of China.
authors.forename: Yufeng
authors.initials: Y
authors.lastname: Cheng
mesh_terms: D000428:Alcohol Drinking / Q000009:adverse effects; D014408:Biomarkers, Tumor / Q000032:analysis; D002294:Carcinoma, Squamous Cell / Q000473:pathology*; D004938:Esophageal Neoplasms / Q000473:pathology*; D006801:Humans; D007150:Immunohistochemistry; D007890:Leiomyosarcoma / Q000473:pathology*; D008297:Male; D008875:Middle Aged; D009378:Neoplasms, Multiple Primary / Q000473:pathology*; D012907:Smoking / Q000009:adverse effects
chemical_list: D014408:Biomarkers, Tumor
keywords: Collision tumor; esophagus; leiomyosarcoma; squamous cell carcinoma
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