3 Differential diagnosis,investigations,and treatment
A retrospective analysis of this case indicated that the gastric mass was larger than 2 cm, accompanied by gastrointestinal symptoms, and did not involve other organs, making resection a reasonable approach. Additionally, IgG4+ cells can also be found in calcifying fibrous tumour, gastric stromal tumor as well as other inflammatory and tumor diseases[2]. Immunostaining did not detect vimentin or CD117, and diagnostic scans revealed the absence of disease in additional organs. With the high serum IgG4 level of eggs, a diagnosis of food-specific IgG4-GID is finally being considered. The mechanism of Food-specific IgG4-RD remains unclear, and diet therapy is usually the first treatment option, with hormone therapy even biological agents considered if symptoms persist or show improvement[3, 4].Considering food-specific IgG4-GID, dietary control therapy was performed.