title: Ultrasonography combined with contrast study in diagnosing gastrointestinal malignant tumors.
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D003110:Colonic Neoplasms / Q000175:diagnosis; D003287:Contrast Media; D005260:Female; D005770:Gastrointestinal Neoplasms / Q000175:diagnosis* / Q000000981:diagnostic imaging; D006801:Humans; D007414:Intestinal Neoplasms / Q000175:diagnosis; D008297:Male; D008875:Middle Aged; D011859:Radiography; D013274:Stomach Neoplasms / Q000175:diagnosis; D014463:Ultrasonography / Q000379:methods*
chemical_list: D003287:Contrast Media