Exfoliative cytology of the upper gastrointestinal tract.
D000230:Adenocarcinoma / Q000175:diagnosis; D002294:Carcinoma, Squamous Cell / Q000175:diagnosis; D003581:Cytodiagnosis; D003937:Diagnosis, Differential; D004938:Esophageal Neoplasms / Q000175:diagnosis; D005770:Gastrointestinal Neoplasms / Q000175:diagnosis*; D006801:Humans; D013274:Stomach Neoplasms / Q000175:diagnosis