Endoscopic cytology and biopsy in the upper gastrointestinal tract.
D001706:Biopsy / Q000379:methods; D003581:Cytodiagnosis / Q000379:methods; D004386:Duodenum / Q000473:pathology; D004724:Endoscopy / Q000379:methods*; D004947:Esophagus / Q000473:pathology*; D005336:Fiber Optic Technology; D005770:Gastrointestinal Neoplasms / Q000175:diagnosis / Q000473:pathology*; D006801:Humans; D013270:Stomach / Q000473:pathology*; D013997:Time Factors