The red-colored blood count found a beneficial macrocytosis having elevated mean corpuscular hemoglobin quantity (thirty six 1 g/dl) and volume (10dos fl ?m 3 ). The vitamin Btwelve level was borderline low (203 pg/ml), with a borderline pathological Schilling test (9.85% absorption; after substitution of intrinsic factor, % absorption). Antibodies specific for thyroglobulin, parietal cells, and microsomes were not detectable. Stool tests for parasites were negative. A gastroscopy was refused by the patient. The CSF...