Cytology as an aid to endoscopy.
D002299:Cardia; D003581:Cytodiagnosis; D004724:Endoscopy; D004938:Esophageal Neoplasms / Q000175:diagnosis*; D005770:Gastrointestinal Neoplasms / Q000175:diagnosis*; D006801:Humans; D008297:Male; D008875:Middle Aged