Diagnostic methods of esophagus cancer are all, except:

Diagnostic methods of esophagus cancer are all, except:

Diagnostic methods of esophagus cancer are all, except: 


A. Contrast investigation of esophagus
B. Esophagoscopy
C. Mediastinoscopy
D. Cytologic investigation of esophagus washing
E. Biopsy from tumor during endoscopy


Answer: C. Mediastinoscopy


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