目的　探讨放射性核素99mTcO-4 腹部显像对小儿消化道出血中胃粘膜异位症的诊断价值。方法　对10 3例消化道出血患儿行放射性核素99mTcO-4 腹部显像 ,以腹部出现异常放射性核素浓聚影为阳性。阳性者全部行手术治疗 ,并有相应病理对照 ;阴性者行胃镜或其它检查。结果　 10 3例消化道出血患儿中核素浓聚影阳性者 36例 ,均经手术病理证实为异位胃粘膜 ,其中初次发病时间为 1岁以内者 2 1例。结论　放射性核素99mTcO-4腹部显像是诊断胃粘膜异位症特异性较高的一种方法 ,对临床诊断和治疗有重要的指导意义。 Objective To investigate the diagnostic value of radionuclide 99mTcO-4 abdominal imaging in the diagnosis of gastric mucosa in children with gastrointestinal bleeding. Methods The radionuclide 99m TcO-4 abdominal imaging was performed on 103 children with gastrointestinal bleeding and the abnormal radionuclide concentration in the abdomen was positive. All were positive surgical treatment, and the corresponding pathological control; negative endoscopy or other tests. Results 36 cases were positive for radionuclide-positive in 10 3 cases of children with gastrointestinal bleeding, all of which were proved to be ectopic gastric mucosa by operation and pathology. Among them, the initial onset time was 21 cases less than 1 year old. Conclusion The radionuclide 99mTcO-4 imaging is a specific method to diagnose gastric mucosal dysplasia. It has important guiding significance for clinical diagnosis and treatment.