Heterotopic Gastric Mucosa at the Duodenojejunal Junction: A Rare Lesion Prone to Misdiagnosis as a Tumor
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An 18-year-old female patient presented with a 1-year history of postprandial abdominal distension and belching. Physical examination revealed no abnormalities. Upper gastrointestinal contrast examination revealed dilation of the intestinal tract at the duodenojejunal junction. Non-contrast and contrast-enhanced CT scans revealed a well-defined space-occupying lesion at the duodenojejunal junction, which exhibited enhancement characteristics identical to gastric mucosa. Gastroscopy identified a broad-based submucosal protrusion located 6 cm distal to the duodenal papilla, displaying features characteristic of gastric mucosa. Pathological examination confirmed the presence of heterotopic gastric mucosa.
