Cytology of the esophagus.
D000328:Adult; D000368:Aged; D003581:Cytodiagnosis; D003937:Diagnosis, Differential; D004938:Esophageal Neoplasms / Q000175:diagnosis*; D004947:Esophagus / Q000473:pathology*; D006801:Humans; D008297:Male; D008722:Methods; D008875:Middle Aged