title: Anemia and abnormal upper gastrointestinal study in a 15-year-old adolescent.
mesh_terms: D000293:Adolescent; D000748:Anemia, Macrocytic / Q000175:diagnosis; D005500:Follow-Up Studies; D006801:Humans; D007408:Intestinal Absorption; D007437:Intrinsic Factor / Q000378:metabolism; D008201:Lymphangiectasis, Intestinal / Q000175:diagnosis*; D008286:Malabsorption Syndromes / Q000175:diagnosis*; D008297:Male; D011504:Protein-Losing Enteropathies / Q000175:diagnosis*; D011507:Proteinuria / Q000209:etiology; D014805:Vitamin B 12 / Q000378:metabolism; D014806:Vitamin B 12 Deficiency / Q000175:diagnosis* / Q000473:pathology
chemical_list: D007437:Intrinsic Factor; D014805:Vitamin B 12