A case of enteric duplication is reported in which preoperative pertechnetate 99Tc(m) scanning demonstrated localized uptake in the region of the anatomic abnormality. This test is recommended for use in the evaluation of lower gastrointestinal bleeding in infants and children. Since 99Tc(m) is metabolized much like the chloride ion, it is actively concentrated and secreted in gastric mucosa, presumably by parietal cells. In those patients having ectopic gastric tissue within a Meckel's diverticulum, abdominal scanning may demonstrate localized uptake of the radionuclide over the anatomic anomaly. Increased local uptake of 99Tc(m) has also been described in other conditions characterized by the presence of ectopic gastric muscoa.
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